I have 2 angels in with my community fish. One angel is about 6" from tip to tip. The other is slightly smaller. They have all been fine until now. I also have a 3" blue gourami in with my tiger barbs and angels. The angels are now picking on the gourami pretty bad. I might have to move the gourami to my mother in laws tank. She has a 40 gallon community set up. I really like him, but the angels are becoming too aggressive to have them together anymore.