How Many Glofish In A 10 Gallon Tank

Last Updated on 2024-07-02

Glofish are colorful and can glow in the dark under blue or black light, especially when kept in a group. However, their needs vary depending on the species, so knowing how many Glofish you should keep is absolutely important.

In this article, you’ll learn how many Glofish you can put in a 10-gallon tank and more. So, keep reading!

Key Takeaways:

  • The number of Glofish suitable for a 10-gallon tank varies based on the species: 3-5 Glofish tetras, 3-4 Glofish danios, 1 male Glofish betta, or 3 female Glofish bettas are recommended. Glofish sharks and barbs require larger tanks due to their size and behavior.
  • Glofish tetras are very active fish and should be kept in groups of at least five in a 10-gallon tank. Glofish danios, similar in size to tetras, can be kept in a 10-gallon tank with about three or four due to their playful nature and need for space. Glofish bettas should be limited to one male in a 10-gallon tank due to their territorial behavior, while up to three female bettas can coexist.
  • Glofish sharks are too large and territorial for a 10-gallon tank and are recommended to be kept in a minimum of a 50-gallon tank. Glofish barbs, which grow to about 3 inches, should be kept in groups of at least six and are better suited for a 20-gallon tank due to their size and activity level.
  • Consider the specific needs and behaviors of each Glofish species, with some needing to be in groups and others better off alone due to territorial tendencies.

How Many Glofish In A 10 Gallon Tank?

Glofish are not a single type of fish. Instead, they are a group of popular freshwater aquarium fish that were modified to glow.

How many glofish you can keep in a 10-gallon tank depends on the type of glofish. You can keep 3-5 glofish tetras in a 10-gallon tank, 3-4 glofish danios, 1 male glofish betta or 3 female glofish bettas. Glofish sharks and barbs will require a bigger tank.

Keep in mind, though, that a 10-gallon tank is a small fish tank, and it has some problems. For example, because the tank is small, it is harder to keep the water stable because there is less water to dilute the toxins. A small fish tank also gives the fish less room to swim, which is not good for active fish like some types of glofish.

Check out this table for the summary of which glofish you can keep in a 10 gallon tank.

Glofish SpeciesRecommended Quantity for 10-Gallon TankTank Size SuitabilityAdditional Notes
Glofish Tetras3-510 gallonsActive, group swimmer. Consider long-finned type for space needs.
Glofish Danios3-410 gallonsVery active, playful. Water temperature adaptable. Regular water changes advised.
Glofish Bettas1 male or 3 females10 gallonsMales are territorial; consider tank dividers if keeping multiple males. Females may show hierarchy.
Glofish SharksNot recommended for a 10-gallon tankLarger tank (>50 gallons)Territorial, need ample space and hiding spots.
Glofish BarbsNot recommended for a 10-gallon tankLarger tank (20 gallons)Active, swim in groups. Can be aggressive toward other fish. Regular water changes recommended.

How Many Glofish Tetras In A 10 Gallon Tank?

Glofish tetras are very active fish that like to swim in between your aquatic plants, rocks, driftwood, and around other things in the tank. They also swim in groups, so you need to keep at least five of them together. As such, they’ll need plenty of room to swim around in.

A maximum of five Glofish tetras can live and swim in a 10-gallon fish tank. Glofish tetras can grow to be between 1.5 and 2 inches long. And while a bigger tank is always better if you keep their tank clean, a 10-gallon tank will be fine.

It’s also important to remember there are two different kinds of glofish tetra, the standard and the long-finned. The long-finned glofish tetras are a bit bigger than the regular ones, and they can grow up to 2.5 inches long. If your long-finned glofish tetras grow that big, you might only be able to keep 4 of them.

In the Aquarium, one glofish thorny fish swims.

How Many Glofish Danios In A 10 Gallon Tank?

One of the most beautiful additions to any aquarium is a school of glofish danios, which are glowing modified versions of danio rerio. They are not only social fish, but they are also active and like to play. They are often seen racing from one end of the tank to the other, chasing each other.

GloFish Danios can grow to a maximum length of 2.5 inches, making them roughly the same size as glofish tetras. Like the long-finned glofish tetras, they should be able to fit in a 10-gallon fish tank with about three or four. Since they are very active, you should change the water often to keep the ammonia levels low.

Glofish danio can be easy to take care of because they can live comfortably in water that is between 64 and 65 degrees Fahrenheit, so you might not need a water heater. They can also easily adjust to different types of water in fish tanks. They are also very hardy and can live in less-maintained fish tanks.

How Many Glofish Bettas In A 10 Gallon Tank?

Glofish bettas are beautiful freshwater fish that were genetically modified to glow in the dark. They have beautiful fins and tails and a bright color that makes them stand out in any aquarium. A glofish betta is so stunning to look at that you won’t be able to help but admire it.

If the right conditions are set up, three glofish betta females can live in a 10-gallon tank. But, like regular bettas, male glofish bettas are territorial and aggressive fish, so you can only put one male in a 10 gallon tank.

If you want to put more than one male glofish betta in a 10-gallon fish tank, you should use a tank divider to keep them from fighting. If you don’t want to use a tank divider, then put female glofish bettas in the same tank instead of males as they are less aggressive.

However, you need to remember that female glofish bettas will form a hierarchy among themselves, so you may need to keep an eye on them if they get aggressive with each other.

How Many Glofish Sharks In A 10 Gallon Tank?

Glofish sharks and rainbow sharks are pretty much the same, and they need about the same care. They are quite large fish that are territorial and can be aggressive if other fish come into their territory. Even though they may seem intimidating to keep, glofish sharks are actually a great addition to any community fish tank as long as you have a big aquarium with lots of hiding spots and plants.

You can’t put a glofish shark in a 10-gallon tank because they are too big and are very territorial. They can grow up to 6 inches on average, but some aquarists have seen them grow to 8 inches. A glofish shark would not be able to live comfortably in a 10-gallon fish tank.

Many experienced fish keepers say that you should put your glofish shark in a 50-gallon tank. Also, the tank has to be long instead of tall so that the glofish shark has a lot of room to swim side to side. Since their ideal tank is long and short, you need a lid to cover the top of their fish tank to keep them from jumping out.

How Many Glofish Barbs In A 10 Gallon Tank?

One of the most well-known glofish species is the glofish barb. They have four black stripes that go from the top of their bodies to the bottom, making a beautiful contrast with their bright color. These beautiful glowing fish are very active, and you would often see them darting and swirling around your fish tank.

Glofish barbs swim in groups, so you should try to keep at least 6 of them in a fish tank together. This means that glofish barbs can’t live in a 10-gallon fish tank. Glofish barbs can also grow to be about 3 inches long, so they need a bigger space to live comfortably.

For the glofish barbs, a 20-gallon fish tank would be the best size. Also, it’s important to know that glofish barbs can be aggressive and would chase and bite the fins of other shy or slow-moving fish. They are also very active fish, so you would need to put in a filter and change the water in your aquarium often.

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How Many Glofish Should Be Together?

Glofish are beautiful fish that are made up of parts of different species of fish. So, you need to know exactly what kind of glofish you want to keep in order to know how many you need to put together. Since there are different kinds of glofish, each kind has its own habits and needs.

Glofish danios, tetras, and barbs all swim in schools, so they should be kept in groups of at least six. Glofish betta are very territorial and aggressive, especially the males, so they do fine when left alone. Glofish sharks do well on their own and may even attack other glofish sharks if put together, but they can live peacefully with other fish in a large community aquarium.

When keeping glofish, it’s important to figure out what kind of glofish you want to keep. Glofish species have a lot of the same needs as their regular counterparts, so they can live with them, except for glofish, bettas, and sharks, who are solitary fish.

For additional reference, check out this video by Zeek’s House featuring his Glofish Aquarium!


Glofish are a very popular type of fish because they have a beautiful color and glow in a way that isn’t natural, especially when they are in blue or black light. Even though they are different from other fish, they are still the same as regular fish. To keep your glofish healthy, you should put them in tanks that give them the space they need.

Also, it’s important to put them in groups if they are schooling glofish or leave them alone if they are territorial and aggressive. You don’t have to worry about your glofish as long as you feed them well and put them in a tank with the right amount of water and the right size.


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