How Many Betta Fish Can You Put In A 90-Gallon Tank

How Many Betta Fish Can You Put In A 90-Gallon Tank

Betta fish, also known as Siamese fighting fish, are popular pets due to their vibrant colors and unique personalities. Keeping bettas in a suitable environment is crucial for their overall well-being.

One common question among betta enthusiasts is how many betta fish can be comfortably housed in a 90-gallon tank. In this article, we will explore the factors to consider when determining the appropriate number of betta fish for a tank of this size.

Factors to Consider

Before diving into the specific number of bettas that can be kept in a 90-gallon tank, several factors need to be taken into account.

These include the territorial nature of betta fish, their compatibility with tank mates, and the importance of providing adequate space for each individual fish.

Territorial Nature of Betta Fish

Betta fish are renowned for their territorial behavior. Male bettas, in particular, are highly aggressive towards other males and may engage in fierce fights if housed together.

It is crucial to provide each betta fish with enough space to establish its territory, reducing the chances of aggression and stress-related health issues.

Compatibility with Tank Mates

While bettas are known for their aggression towards other bettas, they can coexist peacefully with certain tank mates. Carefully selecting compatible tank mates, such as peaceful community fish, can help create a harmonious environment within the tank.

However, it’s important to research and consider the specific needs and temperaments of each potential tank mate before making any decisions.

Providing Adequate Space

Just like any other fish, bettas require adequate space to swim, hide, and explore. In a crowded tank, stress levels can increase, leading to compromised health and behavior.

To ensure the well-being of your bettas, it is essential to provide each fish with enough room to move freely and establish their own territory.

Determining the Number of Bettas for a 90-gallon Tank

Now that we have discussed the factors to consider, let’s determine how many bettas you can reasonably keep in a 90-gallon tank.

Considering the territorial nature of betta fish and the importance of providing adequate space, it is generally recommended to keep one male betta per tank.

Male bettas should never be housed together, as they will almost certainly fight. If you still wish to have multiple bettas in a large tank like a 90-gallon, you can opt for a sorority tank with female bettas.

A sorority tank consists of multiple female bettas, usually five or more, living harmoniously together.

However, it is crucial to ensure that the tank is heavily planted with plenty of hiding spots to help reduce aggression and provide territories for each fish.

Remember, when creating a sorority tank, close monitoring is essential to ensure the well-being of all the bettas. If any signs of aggression or stress arise, it might be necessary to remove certain individuals from the tank.

Always be prepared with a backup plan and separate tanks if needed.


In a 90-gallon tank, it is generally best to house one male betta or create a sorority tank with multiple female bettas.

Proper research and planning are key to providing a suitable environment for your bettas.

Consider factors such as territorial nature, compatibility with tank mates, and providing adequate space to ensure the well-being and happiness of your pet fish. Remember, a happy betta is a colorful and lively betta!