While male bettas have a reputation for being aggressive towards one another and should never be housed together, they can be kept with other community fish in a larger tank. Ideal tank mates are peaceful and not prone to fin-nipping, and nothing large and colorful that a betta could mistake for another betta and want to fight. Females can also be kept in community tanks or in groups called sororities if the tank is large enough and there are plenty of hiding places, however males and females should not be housed together.