Before picking a filtration system for your aquarium, it’s best to understand how each stage of the filtration process works, so you can choose the right type of aquarium filter for your needs.
The Three Stages of Filtration
- Mechanical
- Chemical
- Biological
Mechanical
Mechanical filtration’s primary function is to remove particulate from the water. This as achieved by forcing the water through the filter media. The media has to be porous enough to allow the water to flow through freely, but complex enough to trap any debris in the process. The types of media used to handle mechanical filtration include foam, floss and micron paper. In order for any mechanical filtration to function properly regular maintenance is necessary, in order to prevent the filter from becoming clogged. If the mechanical filtration media becomes clogged it can limit the filters performance.
Another important part of maintaining your mechanical filtration media is to reduce the build up of toxic waste byproducts. As the filter captures particles this detritus slowly decomposes, releasing nitrates and ammonia into the water. Even if the filter is still flowing freely, it’s best to change or clean the mechanical filtration media on a regular basis, for the health and longevity of your fish.
While mechanical filtration is one of the simplest stages of the filtration process. Always be aware that the particles it captures have to be removed from the tank, and they should never be left to decompose. Making sure the mechanical filter media is as clean as possible, is one of the best ways to prevent any future filter failures.
Chemical
Chemical filtration provides the means to remove harmful and dangerous substances from an aquariums water. The simplest chemical filter is the activated carbon filter. When certain organic chemicals pass through the carbon filter they are captured in the many small voids in the filter. A carbon filter captures organic chemicals using a chemical bond.
Following a proper replacement schedule is very important, since a chemical filter will no longer provide any benefit once it is fully saturated. In recent years other chemical filters have become available, like phosphate reducers, and filters that remove excess nutrients from the water. For the most part carbon filters are the most commonly used, and are found in most commercially available filters.
Biological
Biological filtration is the process of converting dangerous ammonia and nitrite into less harmful nitrate. This is accomplished by colonies of bacteria that consume the more dangerous waste, and then excrete nitrates. The nitrates are safer for the fish, and they are very beneficial for plants.
For a more in depth understanding of this process, we will have to think back to science class when we learned about the nitrogen cycle. When your fish consume food and release the waste into the tank, that waste is primarily ammonia. Even the solid waste is broken down into ammonia by another group of bacteria.
Once the ammonia is released into the water, an oxygen-loving bacteria called Nitrosomonas feeds on the ammonia. In the process the Nitrosomonas excrete nitrites as their waste product back into the water. Even though nitrites are less toxic to fish, they still can cause harm. This is where the next bacterial species in the nitrogen cycle takes over, Nitrobacter then converts the nitrites into relatively benign nitrates.
Nitrates can be very beneficial in a planted aquarium, since they provide the plants with much needed nitrogen. On the other hand in an aquarium with no plants, you will have to do regular water changes too keep the nitrate levels from becoming to elevated. Some of the problems associated with high nitrates levels, are algal blooms and the fish can be harmed if the levels get too high.
In order for the Nitrogen Cycle to take hold, there must be a suitable substrate for the bacteria to colonize. The bacteria also need an adequate supply of oxygen to convert ammonia into nitrites and nitrates. While biological filtration occurs to some degree on all surfaces in the aquarium and the filter, it’s best to provide a substrate with a high surface area for the bacteria to colonize.
The gravel and rocks in an aquarium can also add some biological filtration capacity, depending on how porous the rocks are. In most cases filters provide a specifically designed area for biological filtration. These specialized stages have a high surface area for bacterial colonization. And they should also have sufficient exposure to oxygen for proper operation. These surfaces should never be cleaned with chlorinated water or any other chemicals, since that will kill the bacterial colonies and destroy the aquariums nitrogen cycle.
Types of Aquarium Filters
There are quite a few types of aquarium filters, some are more suitable for small tanks and others are best for a large aquarium. While all these filters provide the three primary stages of filtration, each one comes with its own pros and cons in any given aquarium setup. The main types of filters we are going to examine are:
- Hang on Back/Power filter
- Under Gravel
- Internal
- Canister
- Wet/Dry
Hang On Back/Power Filters
The most widely used filter for hobbyist aquariums is the power filter. They are mounted on the tank with the main filtration compartment hanging outside the aquarium. Power filters come with the pump and all necessary components built-in, making them a completely self contained drop in solution. They are usually very easy to maintain and provide excellent mechanical, chemical and biological filtration.
Power Filters have easily replaceable filtration media that can be accessed from the top of the device. Being outside of the tank also allows for easy troubleshooting of any problems that may arise in the course of their daily operation. These filters are also widely available from a variety of manufactures and retailers, making it easy to find a filter that meets most peoples filtration needs.
Mechanical filtration in a power filter is handled by a floss or foam filtration medium. In most cases floss filter material is less reusable and tends to be more prone to degradation. While foam filters can in some cases be cleaned and reused multiple times.
In most power filters the mechanical stage can easily get clogged. This can lead to water bypassing the filter, by either going over or around it. The chance of having a clogged mechanical filter is dependent on the clarity of the water, and the number of fish in the aquarium. For this reason cleaning or replacing the mechanical filter should be assessed on a tank by tank basis.
Chemical filtration in most power filters is usually handled by activated carbon filter media. Some power filters provide extra compartments for phosphate reducers, or other chemical filtration media. The activated carbon filters lifespan will depend on the organic biological load inside the aquarium. If the tank is heavily stocked, this will necessitate changing the activated carbon more often versus a lightly populated aquarium.
An important point to consider before selecting a power filter, is that some manufacturers combine the mechanical and chemical stages into a single cartridge. This can make maintenance simple since you will have a single drop in replacement for the whole filter. On the other hand this will limit your ability to clean and reuse the mechanical filtration media.
If you prefer doing some extra hand cleaning to extend the life of your filter media. Make sure before purchasing a power filter that it comes with separate mechanical and chemical media.
Biological filtration is also handled inside the filter cartridge, because the bacteria will colonize the mechanical and chemical filtration media. While this will provide a good level of biological filtration, there are limits to this method. Since the cartridge is always submerged the bacteria will have less oxygen to break down any waste products.
Another issue is when it comes time to replace or clean your filter cartridge, you will lose a significant portion of your filters bacteria colony. Which is another reason for having separate mechanical and chemical filtration media. In that case you can replace or clean one filter, while leaving the other alone. Doing filter changes this way will preserve the bacteria colony, and help with the colonization of the new filter. In most new power filters this issue has been addressed to some extent, by including specialized compartments with biological filtration substrates that don’t need to be replaced.
The Bio-Wheel is one such specialized biological filtration method available on some power filters. Bio-Wheels function by passing the filters outlet water over a rotating water wheel. The wheel acts as a very efficient substrate for bacteria to colonize. Bio-Wheels also provide maximum oxygen availability for the bacteria. And they require minimal maintenance, so the bacteria can be left undisturbed during routine filter changes.
There are a few cases where power filters should be avoided. A power filter should not be used on a saltwater aquarium, since any excessive splashing can lead to salt splatter. The salt can then get under the hood of the tank which can cause damage to the lights and other equipment.
If you have a planted aquarium you should also avoid using a power filter, since they cause excessive water agitation. And this agitation can release carbon dioxide from the water. This can harm the plants in the aquarium, since they need the carbon dioxide to photosynthesize. In this case a power filter would not be the best choice. In this scenario another filter like an internal model should be considered as an alternative option.
External Filters
Canister Filters
Another popular filter choice for an aquarium is the canister filter. They can be a little more complex to setup and manage, but can offer better filtration performance. Canister filters are an external filter and are usually placed in the stand or another out of the way place. A Canister filter can help increase the aesthetics of your tank, but they can make it a little harder to do certain maintenance tasks.
Canister filters come in two main varieties. Either they come with a built in pump, or they are completely passive and just contain the filter media. If you already have a water pump, this can save you some money since a stand alone canister filter can be a less expensive option.
Canister filters use two hoses to operate, one to pump water out of the tank and the other to return the water back to the tank. Since canister filters are usually placed some distance from the tank, they will require stronger water pumps to function efficiently.
The increased pump pressure will enhance mechanical filtration efficiency. The pressure can be used to push water through a much finer filter material. When choosing mechanical filtration media for a canister filter, you can use filter media rated for particles as small as one micron. That means a canister filter can remove particles better than many other kinds of filters.
Chemical filtration is also enhanced by the increased internal pressure of a canister filter. Since the chemical filter is under high pressure, the water can permeate all the voids available inside the filter media. This is a lot better than other low pressure systems where water can bypass some of the internal structure of the filter. Phosphate and other nutrient reducers are also more effective for this very same reason. Since the filter will be removing chemicals at a faster rate, the chemical filter media may have to be replaced more often.
Canister filters are a completely closed pressurized system, so biological filtration is totally dependent on the dissolved oxygen in the water. Most canister filters contain a substrate for bacteria to colonize, these include ceramic, gravel or any other highly porous material. Since a canister filter has no access to atmospheric oxygen, they are sometimes paired with a wet/dry filter or a Bio-wheel. As long as sufficient oxygen is present, or supplemental bio filtration is provided, canister filters will do an adequate job of bio filtration.
Canister filters are also widely available in a range of sizes and configurations, and they tend to be in the middle to high price range. They are a great choice for those who have unique aquarium configurations. Planted aquariums will work well with a canister filter, since the return water line can be placed in the water, which can minimize carbon dioxide loss.
Also since planted aquariums require less biological filtration, you can get away with using a canister filter exclusively in those situations. Canister filters are also perfect for custom reef aquariums. If you already have a wet/dry filter or a refugium, adding a canister filter can increase overall water quality with minimal changes.
Wet/Dry Filters
The wet/dry filter is usually used on large fresh and saltwater aquariums. The wet/dry system is comprised of two main components, the overflow box and the filtration unit. The overflow box is located inside the aquarium, and it serves the function of supplying the filter unit with water. The overflow system itself is made up of two compartments. One of the compartments is inside the tank, and the other one is connected to the first but remains outside of the aquarium.
The water level which controls the overflow process is driven by the return pump, which is located in the wet/dry filters sump. When the water level reaches a certain point inside the first compartment of the overflow box, the water then flows out into the second compartment. This water then supply’s the main wet/dry filter with water via the connected plumbing. Another nice feature is that the water level of the tank can be controlled by making adjustments to the overflow system.
Once the water is on it’s way to the main filter unit, it is first passed through a porous sponge media. The sponge filter removes any large particulate before it enters the biological filtration compartment. Water is then dripped or sprayed onto the biological filtration media. After the water passes through the biological filter it settles in the sump portion of the filtration unit, and is returned to the tank via a submersible pump.
Mechanical filtration in a wet dry setup is provided solely by the sponge filter. The sponge removes large debris from the water before it can foul up the biological filter. Due to the fact the wet/dry filter operates using an overflow system, the sponge must be very porous so as not to restrict the flow of water entering the filter. If the sponge restricts the flow of water too much it could cause the aquarium to overflow, or it could lead to the sump running dry. For these reasons the mechanical filtration provided by a wet dry filter is inherently limited.
Chemical filtration can be supplied in a wet/dry system by adding specially designed chemical filter media. If you add chemical filter media to the main filter unit, the chemical filtration process is limited. This is mainly due to the water only being trickled over the chemical filter media. If on the other hand you add a canister filter on the return line, you can provide very efficient chemical filtration to a wet/dry system.
Biological filtration is where wet/dry filters really excel. This is due to the large surface area of the biological substrate. And the unfettered access to oxygen this kind of filter provides. In most wet dry systems Bio-Balls are used as the filter media. These plastic balls have channels and grooves molded into them in order to increase their overall surface area. Other kinds of media such as ceramic or rock can also be used in the filter. And specially designed activated carbon Bio-Balls are also available. A Wet/Dry system will provide the best biological filtration of any type of filter, as long as it is properly sized to meet the bio-load inside the aquarium.
Another place where a wet/dry system should not be used is in a planted tank. The reason for this is that the biological filter is completely exposed to the air, which will cause a huge carbon dioxide loss inside this kind of system. The exposed filter media can also lead to increased evaporation which could be undesirable in certain conditions.
Wet/dry filters are perfect for large complex aquariums where custom plumbing and multi-stage filtration are the norm. While most commonly found in large saltwater setups, wet/dry systems are also very effective in freshwater aquariums. Since a wet/dry system requires more skill and space to operate, they are not commonly used by beginners or hobbyists. As with all filtration systems wet/dry filters have their pluses and minuses, but if you are going to run a large aquarium with a high stocking density, nothing really compares to a wet/dry filter.
Internal Filters
Internal Power Filters
Similar to external power filters, these units are complete self contained systems. Internal power filters utilize a built in pump and filter media to treat the water in an aquarium. They can be used in locations where external power filters either won’t fit, or where they would be deemed unattractive. They also have the added benefit of being very quiet, and they are not prone to splashing like external power filters.
Mechanical filtration is handled either by floss or foam media. Foam media is usually the preferred type of media used in most internal power filters. Internal power filters also tend to have smaller filter cartridges than external power filters. The small filter size is due to the internal power filter itself being smaller than a regular power filter. The smaller filter cartridges will necessitate more frequent filter maintenance.
Chemical filtration is usually handled by activated carbon. The activated carbon is usually incorporated into the mechanical filtration cartridge. This means that when one part of the filter needs to be changed you will have to change them both. Since the activated carbon has to fit into an already small filter cartridge, it can limit the effectiveness of the chemical filter.
Biological filtration will also be somewhat impaired when using an internal power filter. The real limit on the biological filter is the oxygen in the aquariums water. Placing the power filter closer to the water surface can provide more oxygen which will enhance biological filtration.
As with any filter where both the mechanical and chemical filters are replaced at the same time, significant bacterial loss can occur. Some internal power filters use a two cartridge system, which can help alleviate this concern. Though in most smaller units only one cartridge slot is provided. Given these limitations, care should be taken when replacing the filter media.
While internal power filters might sound like a compromise on most fronts, there are situations were they are a very good fit, One of those being in a planted tank. Since they don’t disturb the surface of the water very much, they will help keep carbon dioxide in the water. And their weakness in biological filtration is not as much of an issue, since the plants will provide excellent biological filtration in most cases.
Another good use for an internal power filter is supplemental filtration. This is especially useful in a large tank that has many potential dead zones. These dead zones can arise if the main filter is not completely turning the water over evenly throughout the tank. An internal power filter can fill in those gaps, so you can be sure the tanks water is fully turned over.
Internal power filters do have their strengths and weaknesses, but they can be can be leveraged to your advantage in a wide range of aquariums.
Sponge/Air Driven Filter
Another filtration method usually reserved for smaller tanks is a sponge filter. Sponge filters use air to pull water through a sponge, which results in surprisingly efficient mechanical and biological filtration. Since an air pump provides the force necessary for the filter, a separate air pump might be needed to get maximum benefit from a sponge filter.
The mechanical filtration provided by a sponge filter, is mainly limited by the power of the air pump driving the filter. This can make a sponge filter less efficient than most other filters. In small tanks with minimal bio-load this level of mechanical filtration can be more than adequate. Mechanical filtration can also be hampered by any detritus clogging the sponge. If this happens it can limit the sponges ability to remove particles from the water. In order to avoid this problem regular maintenance will be needed. Cleaning the sponge will ensure water continues to cycle smoothly through all of its pores.
Biological filtration is adequate in most sponge filters, since the bacteria have a large surface area inside the sponge to colonize. But since the sponge filter is completely submerged the bacteria will have less access to oxygen. The low oxygen issue is somewhat countered by the fact that the air bubbles from the air pump are in close proximity to the sponge. Those air bubbles can deliver a good dose of oxygen to the bacteria inside the sponge.
One other thing to be aware of is not to damage the bacteria when cleaning a sponge filter. The best way to clean a sponge filter, is to squeeze out any debris in a bucket filled with water taken from the aquarium. By cleaning a sponge filter this way you will not be exposing the filter to any chlorine that can kill off the bacteria.
The main use for a sponge filter is for fish that can’t handle turbulent water, or fish that might get sucked into other filtration systems. They are great for breeding tanks, and will help keep fry mortality to a minimum.
Another reason to add a sponge filter is to decrease dead zones, and increase oxygen in the water. And if you see waste build up in the corners of the tank you might want to try adding a sponge filter.
Sponge filters are affordable and widely available, and they come in a wide range of sizes, so finding one that is suitable for your tank should be easy.
Under gravel Filters
Under gravel filters are another form of internal filter. They use a large grated plate that covers the entire bottom of the aquarium. The plate is then covered with gravel which acts as the filtration media. Water circulation is handled by an air pump, which is connected to uplift tubes that create a siphon effect and draw water through the gravel.
Mechanical filtration happens when particles get trapped in the voids of the gravel substrate. While this method of mechanical filtration will work, it is not as efficient as floss or foam filters. Trapping all the particulate in the gravel can also cause problems in the long run. Manually cleaning the gravel will be very important in order to prevent clogging of the substrate. And the build up of detritus can release toxic byproducts that can cause the aquariums inhabitants harm.
Chemical filtration is usually not provided by most under gravel filters. This means in most cases that any chemical filtration will have to be provided by a supplemental filter. Some newer models of under gravel filter do include activated carbon cartridges, but these are not as readily available in most stores. If you need chemical filtration be sure to find a model that offers this option.
Biological filtration also relies completely on the gravel. Gravel usually has a large surface area for the bacteria to colonize. Though it’s important to remember that bacterial colonization will be totally dependent on the type of gravel. Smooth gravel that is less porous will have much less surface area for the bacteria to colonize.
Another limitation of using gravel for biological filtration is the limited oxygen available. The deeper levels of the gravel will most likely have anoxic conditions. And any location that has objects that obstruct the surface of the gravel will limit the flow of water. Those obstructions will make those areas dead spots in the under gravel filter. For optimal performance keep the gravel clean and level. And make sure it is unobstructed, so the gravel filter will work at its peak efficiency.
One type of aquarium setup where an under gravel filter should not be used is in a planted tank. If an under gravel filter is used in a planted tank you run the risk of the roots clogging the filter. And the added debris present in a planted tank can also stop up the filter.
Under gravel filters are a good low price option for small starter aquariums. If you have a very small aquarium then an under gravel filter can be a good option, since it will not monopolize valuable tank real estate. If you decide to use an under gravel filter, just be sure to clean the gravel on a regular basis to keep the filter working at its peak performance.
![Best Filter for an Oscar Fish Tank Oscar fish are voracious eaters that can grow to be up to 14 inches long. They need a lot of space and a big tank, but they also need good filtration. This is because Oscars produce a large amount of waste for their size, which can quickly pollute the water if not managed properly. Read on to see the best filter for an Oscar fish tank. [toc] Best Filter for an Oscar Fish Tank ***TABLE**** Best Filter for an Oscar Fish Tank OASE Indoor Aquatics Biomaster Thermo 600 The Aquatics Biomaster Thermo 600 Filter (Buy Online) has everything you need to keep water clean and healthy for your fish, plus some cool extra features too. It comes with four different filtration stages that remove debris from the water so your tank stays clear and safe for your fish to live in. Plus, it has a built-in heater which keeps the temperature of your tank consistent so you don't have to worry about fluctuations or sudden changes affecting your fish. The OASE Indoor Aquatics Biomaster Thermo 600 is a reliable and high-quality filter that will keep your water crystal clear. It has four stages of filtration, including a pre-filter module for particle removal, two main filters to clean detritus from the water before it reaches the pump area, an activated carbon stage with 45 ppi pores to trap organic chemicals and reduce odors, and finally a polishing cartridge which traps any particles left after the other three stages have removed most of the large debris. Plus, it comes with Hel-X Biomedia that has an extremely large surface area for beneficial bacteria colonies that break down nitrogenous waste. Overall, this filter can be used on 70 to 160 gallon tanks, and if you want peace of mind about how well your tank is being filtered and heated – this canister filter is perfect for an Oscar tank. Eheim Pro 4+ 600 Filter The Eheim Pro 4+ 600 Filter (Buy Online) is the best filter for an oscar fish tank because it’s easy to use and maintain while providing a high level of filtration. It has a self-priming pump that makes starting up very simple, plus its safety hose adapter means you won’t have to worry about any accidents with this unit. We recommend going with their Pro 4+ model which has been designed specifically for tanks containing Oscars and other larger species of fish. This filter comes with everything you need including extra media baskets, spray bars, adjustable flow control valves, and more. Polar Aurora 4-Stage External Canister Filter 525GPH with 9-watt UV Light The Polar Aurora External Canister Filter (Buy Online) is an affordable yet high-quality canister filter and it has four stages of filtration (biological, mechanical, chemical and UV) that keep your fish tank crystal clear without taking up much space. If you have an Oscar Fish Tank, then you know that they are messy fish. They produce a lot of waste and your tank needs to be cleaned frequently. That's where this filter comes in handy. It can handle tanks up to 200 gallons and has a maximum flow rate of 525GPH from the built in pump. This is more than enough power for even the messiest Oscar Tanks. This unit also comes with three different media trays so you can use any type of filtration media you want - bio balls, sponges or ceramic rings. And not only does this filter provide excellent water filtration, it comes with a built in 9 Watt UV Light that allows it to easily control algae spores/bacteria and maintain clear water in your aquarium at all times. Fluval FX4 High Performance Canister Filter, External Aquarium Filter The Fluval FX4 (Buy Online) is an external filter designed specifically for aquariums housing oscars and other large tropical fish species like cichlids and catfish. There's also three different filtration stages included in this setup which will ensure that all the waste produced by your fish gets filtered out quickly leaving behind crystal clear water every time. The Fluval FX4 is the best aquarium filter on the market because it has a patented self-priming pump that moves 700 US Gal of water per hour. It also comes with all of the media you need to get started filtering your tank immediately after installation - no extra purchases necessary. This external aquarium filter is easy to install, maintain, and clean. With its multi-stage filtration process this canister filter removes harmful toxins from your water while providing superior mechanical filtration through three stages of bio-filtration using BioMax cartridges, activated carbon pads and biological ceramic rings . This powerful filter pumps out 700 US Gal (2650 L) of water per hour so it's perfect for even the largest freshwater or saltwater tanks up to 250 US Gal (900 L) Best Hang On Back Filter for an Oscar Fish Tank AquaClear Fish Tank Filter, Aquarium Filter for 60- to 110-Gallon Aquariums The AquaClear 110 (Buy Online) is a hang-on back filter that has an adjustable flow rate, and it'll last you for years. AquaClear filters make it easy, convenient, and affordable to keep your tank clean without all of the complexity and hassle of a canister filter. The AquaClear 110 filter has been designed with the hobbyist in mind; and it provides superior mechanical, chemical as well as biological filtration media at an unbeatable price point. It's ideal for aquariums up to 110 gallons (416 liters) in size and it has a flow rate of 500 U.S. gallons per hour (1,900 L/h). SeaChem – Large Aquarium Fish Tank Filter, Tidal 110 Gallon The SeaChem Tidal 110 Gallon Aquarium Filter (Buy Online) is one of the few hang on back filters specifically designed for Oscars and other larger tropical fish tanks (up to 110 gallons). This means that it has more than twice the capacity of other hang on back filters so there's no need to clean out debris as often. It also has an adjustable flow control valve - just set the dial where you want it and let the self-priming pump do its job. You can also use any kind of filtration media without worrying about clogging since the patented impeller design keeps everything running smoothly Best Sponge Filter for an Oscar Fish Tank Bacto-Surge Hikari Aquarium Solutions Foam Filter, 125 Gallons Bacto-Surge Foam Filters (Buy Online) are made from a durable foam material which allows them to last much longer than traditional sponge filters. They also don't require any electricity or have any moving parts, so you can use these as a cheap and reliable way to supplement the filtration in your Oscar tank. Best Under Gravel Filter for an Oscar Fish Tank Lee's 125/135 Premium Undergravel Filter, 18-Inch by 72-Inch Lee's 125/135 Premium Undergravel Filter (Buy Online) is the best you can get for an Oscar fish tank. It has a multi-level plate design made of high-quality plastic, so it lasts longer than standard models. And this under gravel filter can also be used to build an anoxic filter to lower nitrates, which improves overall water quality and it will also help keep your fish healthy and disease free. Best Filter Media for an Oscar Fish Tank Premium Authentic Pinky Filter Floss for Fish Tanks Premium Authentic Pinky Filter Floss for Fish Tanks (Buy Online) provides two layers of filtration to keep your tank cleaner & running more efficiently than ever before. It's made in the USA from high-quality materials that are safe for both fish and humans alike. It also reduces maintenance time because it lasts 2x as long as other brands on the market today. AQUANEAT Aquarium Filter Sponge Open Cell Foam Sheet Bio Sponge Filter Media Pad Aquaneat's Black Fine Filter Sponge (Buy Online) is made with natural materials that are non-toxic and safe for fish & plants. It provides mechanical filtration by trapping dirt particles in the pores of the sponge material so they do not get through into your aquarium water where they could cause harm to your aquatic pets. The open cell structure of the Aquaneat Sponge means you can simply rinse it under running water when needed instead of having to replace expensive filters every few weeks. And we've tested these pads with many different types of tanks and they are one of the most durable and economical ways to keep the water in a fish tank free of debris. Seachem Matrix, 4 L / 1 gal. Seachem Matrix (Buy Online) removes ammonia, nitrite and nitrate from the water column in freshwater tanks through a process called denitrification. It does this by providing an environment where beneficial bacteria thrive and convert harmful toxins into less harmful forms (even anoxic bacteria that break down nitrates). This process reduces stress on aquarium inhabitants by reducing their exposure to these toxins while also maintaining pristine water quality in your aquarium Eheim AEH2507051 Mech Filter Media for Aquarium, 1-Liter Eheim Ceramic Cylinders (Buy Online) are reusable so you don't have to waste money on disposable filter cartridges or sponges every time you clean your tank. Simply rinse them out in decholorinated water when they get clogged, and you can reuse them indefinitely. Oscar Fish Tank Size A 70 gallon tank will work for an Oscar, but it's better to keep them in a 100+ gallon tank. The bigger the better. More space promotes greater health while also keeping them happier which in turn reduces the risk of stress and disease. Oscar Fish Water Parameters Oscar Fish Water pH Level Oscars prefer water with a pH between 6 and 8, but they prefer slightly acidic water and they can live in water that has a pH as low as 5.5 quite comfortably. Oscar Fish Nitrite Level The nitrite level in your tank should be at 0 ppm once your tank has cycled. Nevertheless, a weekly 10% water change with fresh water from the tap is always good early on in the cycle to reduce nitrites. Oscar Fish Nitrate Level To keep your Oscar healthy you want to keep your nitrate levels between 10-40 ppm. It's important that you test the water with a Nitrate Test Kit (Buy Online) to ensure the nitrate levels in your tank aren't reaching dangerous levels. If the nitrates in your tank stay consistently over 40ppm, it’s time to clean or replace old filters, clean out uneaten food, vacuum the gravel, and do at least a 25% water change. Oscar Fish Water Temperature The ideal water temperature for Oscars is 75-80 degrees Fahrenheit (23 - 27 Celcius). It's important to remember that Oscar Fish are from the Amazon Rainforest and they need a heater in their tank especially during the winter time If you want to know what size heater you need for your tank you can use our Fish Tank Heater Calculator (Click Here) Oscar Fish Water Change Water changes are an essential part of fish keeping for any type of fish. This is especially true when you have larger fish like oscars that produce more waste. Water changes, or partial water changes, should be done every 1-2 weeks depending on how many fish you keep in your tank Why Is My Oscar Fish Tank Cloudy Fish tank water can become cloudy for a few reasons. The most usual is that the aquarium is either experiencing a bacteria bloom or there is algae in the water column. If this is the case, you’ll need to do a 50%-75% water change immediately. You can also use an inline UV filter if water changes and regular tank maintenance aren't getting control of your cloudy water problem. How To Keep an Oscar Fish Tank Clean Water Changes Vacuum the Gravel Bed Cleaning the Filter Removing uneaten food from tank Check for any algae growth on plants or glass walls of aquarium and clean as needed Test the water regularly Do Oscar Fish Need a Filter Yes, Oscar fish need a filter because they are messy eaters that produce a lot of waste. The filter helps with this issue and also improves the water quality by converting harmful ammonia into less toxic nitrates.](https://thepetsupplyguy.com/wp-content/uploads/Best-Filter-for-Oscar-Fish-Tank-464x290.jpg)
