have tried to breed almost every fish i keep. that is almost the reason why i select the fish i select. mouth brooding african cichlids are very interesting and i have done this in a 29 gal but do not recommend it. angelfish could work in a 29 gal. i would suggest learning about fish you are interested in(livebearers, gouramis,central american...) when you pick out a fish your interested in throw that fish in the forum as a question and see what other people say about that fish. good luck their are alot of them out their