How Many Neon Tetras Per Gallon

How Many Neon Tetras Per Gallon

How Many Neon Tetras Per Gallon? Neon Tetras will need at least 1.5 to 2-gallons of water for each neon tetra you plan on keeping in your fish tank. However, Neon Tetras are schooling fish that like to be kept in groups, so if you want to know the optimal Neon Tetra tank size you can get more information further down this page.

Neon Tetra Tank Size

Neon Tetra Tank Size
Tan Meng Yoe CC BY 4.0

Neon Tetras (Buy Online) only reach a maximum adult size of 1.5 to 2-inches (1.5 to 3.8 cm), but they are active fish that like to dart around and swim all over the place. That’s why it’s a good idea to keep them in at least a 10 or 20-gallon fish tank.

Neon tetras do best in groups, and it’s a good idea to keep a school of five neon tetras in at least a 10-gallon fish tank.

Neon Tetras will also need to be kept in a tank that’s large enough to hold plenty of plants, rocks, and decorations. This will help mimic their natural environment, and it will give them places to hide so they feel safe.

If you want to know how many neon tetras you can add to your tank you can follow the link to our calculator that will help you figure out How Many Fish You can Keep in a Fish Tank.


Buy Neon Tetras

Neon Tetra Petco Neon Tetra – Petco
Neon Tetra - eBay Neon Teras – eBay
6 Neon Tetras – Amazon

How Many Neon Tetras Per Gallon



How Many Neon Tetras In a 5 gallon Tank

A 5-Gallon Tank (Buy Online) can hold at most 2 to 3 Neon Tetras. A small five-gallon tank is a little small for keeping Neon Tetras, but it can act as a good starter tank. As your Neon Tetras grow you’ll want to move them to at least a 10-gallon tank

Five-gallon aquariums will limit the amount of fish you can keep, and it can be harder to maintain a 5-gallon aquarium’s water quality. In most cases, a five-gallon tank is better suited for a fish like a Betta, or other small fish than you can keep in a bowl.



How Many Neon Tetras In a 10 gallon Tank

A 10-Gallon Tank (Buy Online) can hold 5 to 6 Neon Tetras quite comfortably. A ten-gallon tank is a good neon tetra tank size since it can hold a school of neon tetras, guppies, GloFish, or Platies.

A ten-gallon tank is also small enough to fit in a kid’s room on a dresser or on a small table. They are also one of the more affordable tanks, so it won’t cost you an arm and a leg to keep a small school of neon tetras in a 10-gallon tank.



How Many Neon Tetras In a 20 gallon Tank

A 20-Gallon Tank (Buy Online) is big enough for a school of 10 to 13 Neon Tetras. You can even get a mix of fish species and keep neon tetras in a twenty-gallon community tank. That means you could keep 5 Neon Tetras and still have room for GloFish, Endlers Guppies, Snails, Barbs, Platies, or Mollies.

Twenty-gallon tanks are readily available in most fish stores, and you can buy 20-Gallon Tanks online since they are small and light enough to ship for free. A 20-gallon tank is also the best neon tetra tank size since it can hold more decorations, rocks, and accessories. That makes it perfect for Neon Tetras since they prefer tanks with lots of room and plenty of places to hide.



How Many Neon Tetras In a 30 gallon Tank

A 30 Gallon Tank (Buy Online) can hold a large school of 15 to 20 Neon Tetras. With this amount of Neon Tetras, you’ll start to see their true schooling behavior, and they will be more active and less likely to hide when they are afraid.

A 30-Gallon Tank is also longer than a 10 or 20-gallon aquarium, which is good for Neon Tetras since they are active swimmers that like to swim all over the tank

Thirty-gallon aquariums also make great community tanks. This size tank is perfect for keeping medium-sized fish like Angelfish, Rams, Barbs, and Dwarf Cichlids.


Check Out: Best Canister Filter for a 30 Gallon Tank

How Many Neon Tetras In a 40 gallon Tank

Cardinal_tetra_&_neon_tetra - úlfhams_víkingur CC BY 2.0
úlfhams_víkingur CC BY 2.0

A 40 Gallon Tank (Buy Online) is the perfect size for a school of 20 to 26 Neon Tetras. A forty-gallon breeder is also a great fish tank since it’s still relatively compact, but it holds enough water to keep larger fish species.

Of course, if you plan on keeping Neon Tetras you’ll want to avoid keeping them with aggressive fish. However, a school of neon tetras will get along well with Gouramis, Angelfish, Kuhli Loaches, Plecos, Dwarf Frogs, and Mollies.



How Many Neon Tetras In a 55 Gallon Tank

Tetra 55 Gallon Aquarium Kit

A 55 Gallon Tank (Buy Online) is large enough to hold a school of 28 to 36 Neon Tetras. Fifty-five-gallon fish tanks are one of the most popular tank sizes, and they tend to be one of the least expensive large fish tanks on a cost per gallon basis.

A fifty-five-gallon tank is longer than most comparably sized fish tanks and they offer plenty of horizontal swimming space. They also are a little bit taller than most fish aquariums, which is perfect for Neon Tetras since they prefer to swim in the middle and at the top level of a fish tank.



How Many Neon Tetras In a 75 Gallon Tank

How Many Neon Tetras In a 75 Gallon Tank

A 75 Gallon Tank (Buy Online) can hold at least 38 to 50 Neon Tetras. A large seventy five gallon tank might be overkill for solely keeping Neon Tetras, but a large school of 50 Neon Tetras is truly a sight to see.

In most cases, you’d want to add a few other species of fish to a 75-gallon tank to mix things up a bit. A 75-gallon tank is large enough to hold big fish that might not be compatible with Neon Tetras. So, you want to make sure that any fish you do add to your aquarium will be compatible with small fish if you do plan on keeping Neon Tetras in a 75-gallon tank



Buy Neon Tetras Online


Live Neon Tetras – Petco

Neon Tetra Petco

Neon Tetras (Petco – View Price) can be found at most Petco stores throughout the country. They are usually well stocked and very reasonably priced. Petco also ships live fish, so if you can’t get to the store they’ll ship them right to your door.



Live Neon Tetras – eBay

Neon Tetra - H. Krisp CC BY-SA 3.0
H. Krisp CC BY-SA 3.0

Neon Tetras (eBay – View Price) are available on eBay along with a wide selection of other fish. While some retail stores are frequently sold out of live fish, you’ll always find a good selection of healthy fish from reputable breeders on eBay.



Live Neon Tetras – Amazon

Neon Tetras (Amazon – View Price) can also be purchased on They tend to have a smaller selection than eBay, but they are a good option especially if you’re already an Amazon customer.

Best Neon Tetra Fish Tanks – How Many Neon Tetras Per Gallon


Tetra PLAYMOBIL Explore Your Aquarium 10 Gallon Kit

The Tetra PLAYMOBIL10 Gallon Aquarium Kit (Buy Online) is a great fish tank for a child’s first Neon Tetra tank. It comes with everything you need to get started like a heater, light, filter, decorations, and dechlorinator. It also comes with a reversible background, free toy, pretend play-set, and an activity book for your budding new fish keeper.



Tetra 20 Gallon Complete Aquarium Kit

The Tetra 20 Gallon Complete Aquarium Kit (Buy Online) is an excellent starter fish tank if you want to keep a larger school of Neon Tetras. It comes with a filter, heater, and a hood with a built-in color-changing light. You also get a net, filter media, and decorations that glow under the color changing LED aquarium lights.

Mark Young
Mark has worked with a wide range animals for over 10 years, and he regularly volunteers at his local animal shelter. Mark has decided to share his years of knowledge by writing helpful guides for both new and experienced pet owners