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Number of Betta vs Tank Gallon Size [Complete GUIDE]

Bettas are stunning, vibrant fish that will bring lots of excitement to your aquarium. However, being an aquarist, you should first have the ideal tank size sufficient for the movement and schooling of betta.

Aquarists mostly get confused about how many Bettas can fit in a 10-Gallon tank. Different fish have distinct behavior related to the space they are provided. Your aquarium will develop into a healthy ecosystem, and your fish will have long and fulfilling lives if you make the right decisions.

Number of Bettas in 10-gallon tank:

How many female bettas in a 10-gallon tank? Five to six female bettas can live in a 10-gallon tank as highly active fish. 2-3 male bettas can also live in the same tank, but a divider is needed to keep them calm. Only the expert breeder can manage male and female bettas together in a single tank; otherwise, male and female bettas should never be kept together (because of disputes).

The answer given above is not enough for how many female bettas in a 10-gallon tank.

Continue reading about how to make favorable conditions for your bettas, the male-to-female ratio in a single tank, adjusting your tank for multiple bettas, and much more.

Betta in a 10-gallon tank

How many female bettas in a 10-gallon tank?

Females are less aggressive than male bettas, but the dispute starts if they find a dominating female betta inside the tank.

Bettas are schooling fish and don’t like to live alone, but if you put two female bettas in a tank, a dispute will be started because of the domination of a single female betta.

If three female bettas are adjusted in a single tank due to dominating behavior of one or two bettas, the third one will be in danger.

So Bettas live in a community with a minimum of 4-5 bettas.

The following table will show the size of tanks and the number of female bettas to be placed in.

Water QuantityNumber of female Bettas
5 gallons3 (Not recommended)
10 gallons5
20 gallons10
25 gallons12
30 gallons15
40 gallons20
Number of female bettas vs. tank size

How many male bettas in a 10-gallon tank?

Male bettas are very aggressive; if we keep them together in a single tank, they will fight each other, and the tank environment will be disturbed, which may lead to damaging kins and death of the bettas.

2-3 male bettas can be kept together only if the divider is placed inside the tank. By dividing the tank, ensure an equal amount of hiding places, plants, and other living parameters.

The following table shows the tank size (with divider) and the number of bettas to be placed in.

Water QuantityNumber of Male Bettas
10 gallons3
20 gallons6-7
25 gallons8-9
30 gallons10-12
40 gallons13-15
Tank size vs. number of male bettas

How many female bettas are in a five-gallon tank?

I recommend keeping one female betta per two gallons, i.e., a maximum of three female bettas in a five-gallon tank, but this will not be a healthy and happy space, as mentioned above.

If you have financial, maintenance and space issues in the home, then use a five-gallon tank, which is easy to buy and maintain and will take up significantly less space in the home but use a divider inside the tank to reduce conflicts.

Can male and female bettas live together?

It isn’t easy to keep male and female bettas together in the same tank. You can keep a single male betta in a school of female bettas; experienced aquarists can work on it, but beginners must avoid it.

The following points must keep in mind:

  • Use big sized tank i,e, 40 gallons, and add a lot of plants and hiding places inside to reduce aggression.
  • There is a chance of breeding inside a tank. Choose the right breeding pair; otherwise, they may damage or kill each other.
  • Use a divider if you have a small-sized tank (smaller than 15 gallons).

The ideal size of tank for bettas

The ideal tank size for bettas is 40 gallons, which can accommodate about 20 female bettas, almost 15 male bettas, and a few more companion fish.

Below are some aspects you must remember when selecting the tank for your betta hobby.

Betta tank requirements

Free space:

Usually, besides the fish, an aquarium is occupied with plants, food, objects that act as hiding places for the betta, a water filter, an air pump, and decoration material.

So you have to remember how much free space for the betta would be available in the tank after all this stuff.

Drawbacks of small and large tanks:

In small tanks, toxins from betta waste accumulate more rapidly, which is risky for betta life.

While in large tanks, bettas, especially their fry, become exhausted in search of food as they swim all around the tank. Larger tanks are tough on pockets as well. So a 10-gallon tank is a recommended tank size for bettas.


Make sure you have enough plants in your tank to absorb the carbon dioxide, nitrate, and other substances that are toxic waste from the fish excretion.

Bettas can survive on their own with just plants and pests. So plantation in the ten-gallon tank is essential.

Water Quality Check

Change the water frequently to eliminate all the toxins. If you have a filter, change the water weekly.

If you do not have a water filter, about 40% of the tank water should be changed daily.

Water filter installation

You need a filter that will eliminate the ammonia by changing it to nitrite and then nitrite into a less toxic form called nitrate.

(Nitrates are removed when you do the water changes in the tank). This process is called the Nitrogen Cycle.

PH Level

Also, make sure to maintain a healthy PH level in the tank. Here is how you can naturally control the PH in your water tank.

Feeding of Bettas

When feeding your bettas, try not to put too much food as it can pollute the water. Stop feeding if they stop eating.

Many aquarium hobbyists mistake feeding their betta fish regular tropical flakes and then wonder why their fish fails to thrive. Betta fish are a predatory species, and traditional flake foods cannot meet their protein needs.

Some important points about feeding betta

  • Betta needs 40-75% of proteins in their food. In their natural habitat, bettas take protein from insects and other fishes, but you just need to provide it in the aquarium.
  • Betta needs lipids, carbohydrates, and fibers in their diet, but lipids (fats) should not be more than 8% in the diet. Otherwise, digestion problems may arise.

Introducing new betta in a tank

Don’t introduce a new betta in a tank containing bettas; otherwise, they start chasing each other. Instead, use a divider in the beginning so they see each other and accept each other. As well as, a new betta settles itself according to the tank’s environment.

If you see them act aggressively, even if they are divided, leave them divided.

Some of the betta tank mates can be:

  • Mystery snails.
  • Ghost shrimp.
  • Moss balls.
  • African dwarf frogs.
  • Small Corydoras species.
  • Some types of tetras.
  • Harlequin rasboras.

Dangerous tank mates for bettas

The following species must be avoided from living with bettas:

  • Other male bettas.
  • Tiger barbs.
  • Cichlids.
  • Goldfish.
  • Gouramis.
  • Puffers.
  • Red tail sharks.
  • Angelfish


You can house at most three female bettas in a 5-gallon tank. The fish will survive but won’t be over the moon.

This is because it needs balanced water surroundings and more swimming space, and it is a schooling fish.

The ideal size of tank to be used is a ten-gallon tank.