I have three community tanks (55, 29 and 29) and between them probably at least 30 different fish. What fish do you find are the hardiest in your community tanks and which ones do you find aren't. I have good luck with: any type of cory catfish, rummy nose tetras, cardinal tetras, tiger barbs, clown loaches, angel fish, glass cats, red eyed tetras, angel fish, pricilla tetras, bristle nose plecos and diamond tetras. What don't do well for me: silver tip tetras, ember tetras, mollies, dwarf gourami, and kuhli loaches.