Snootangerines

Black background will be a thing around may or June. Tetras would be wonderful but from what I read they are kind of difficult to breed and I would like for them to reproduce. Is there another suggestion for like a schooling type of fish that will have babies here and there that won’t over populate as well?

30 inches long, 12.4 inches wide, and 22 inches in height. Currently I have 1 angel fish, cherry shrimp, and around 8 guppies. Im willing to take out the guppies and move them to another tank. Currently fish I’m interested in placing here are gouramis (pearl gourami and sparkling gourami) and 3 or 1 angel fish. Would you suggest adding another fish?