ok since you asked.. ...

I had 2 balla, sharks ,and 2 angel fish, and 5 neon tetras, and a sucker fish, AND a betta All in one 10 gallon. My betta loved it. He loved all the other fish. He never attacked them, I watch and researched befor I placed them together to see all my fishes temprements. A betta makes a lively and awsome addition to any tank as long as their is no onther bettas in the tank with it..