I have been told Bettas like to be alone, buy I do have one now in a tank with neon/glowlight tetras. They seem to be doing okay. I also have one betta with three zebra danios. They too seem to be doing okay. The betta with the danios let's them know who is the boss in the tank. I think our bettas are pretty friendly, so far. I don't want to jinkx anything. Good luck.