How Big Does a Betta Fish Bowl Have to Be?

Unlike many other types of commonly kept pet fish, Bettas, or "fighting fish," can survive in small tanks or bowls and do not necessarily need filter systems. However, just because they can live in a small enclosure does not mean they will stay healthy or live a long time in small quarters. Bettas need some space to truly thrive in a captive environment.

  1. Size

    • Oftentimes Bettas will be sold in small plastic containers or bowls that are less than 1/2 gallon in size. This is too small. An adult Betta needs an enclosure of at least 1 gallon to truly thrive, though 2.5 gallons is the recommended smallest size. The larger the tank the more aeration the water needs and the less often the water will need to be changed out entirely.

    Types

    • Many commercially available Betta tanks and bowls are available for purchase through pet stores. Some owners will also use large jars, plastic bins or acrylic boxes. It is important that no matter what type of enclosure is used, it has the proper amount of space as well as a securable lid if the water reaches close to the top. Bettas have been known to jump out of the water, which could mean their death.

    Accessories

    • Tanks larger than 5 gallons should have a filter system to keep the water clean. Those kept in cool environments should also include a water heater, as Bettas are warm-water fish. Gravel, plants and other pieces of fish tank "furniture" can also be included to give the enclosure a more pleasing look as well as to give the Betta places to hide.

    Warnings

    • Water heaters can make the water too hot if used in a tank or bowl that is under 5 gallons. Micro-heaters are made specifically for smaller enclosures, but make sure they have some type of automatic shutoff if the water begins to get too hot. Male Bettas are very aggressive and will kill each other if housed together, so they should not be kept in the same enclosure no matter how much space they have. Females can be kept together if they have been raised or been given experience in a community tank setting. Otherwise even they can become aggressive toward one another.