Here’s another reason why a betta fish may sink to the bottom of an aquarium: the tank itself is the wrong size. If it’s too small, they won’t have ample space to swim comfortably.

A More Affordable 10-Gallon Tank: If you’re looking to get your betta housed in a 10-gallon tank with all the accessories on a budget, check out the Aquaeon Aquarium Fish Tank Starter Kit.

Betta fish tanks may be small, but ensuring that your pet remains in good health still requires keeping up with cleaning, feeding and monitoring pH levels. Be sure that your schedule allows for ...

They don’t require a large tank. Additionally, you don’t need to aerate their tank because they breathe by taking gulps of air. That said, you still need to clean your betta fish’s tank.