You don’t need to keep any fish with Bettas, as they’re perfectly capable of living all by themselves happily. However, if you want, you can put them with same-sized, non-aggressive tropical fish as the temperature range will suit all kinds. However, Bettas can get territorial and may mistake smaller fish for younger Bettas, which they won’t like. Your best bet is to test our certain fish and see what happens, but if you’re concerned at all about what would happen, then maybe steer clear.\r