Thanks for your reply. I have a 3' wide x 2' high by 18" deep tank (180 litres) containing 2 dwarf gourami, 6 neon tetras, red tail shark, clown loach and a fighting fish. I was thinking of getting a pair. The book i've been reading says they are peaceful and can be kept in a community or species tank but community is very vague as i'm sure there are some fish they should not be with. Have you any opinions on angel fish also?