just give them a cave and clean it frequently, and dont put anything but the breeding pair in it or they will most likely kill it, because the female will stay near the young and protect them, while the male patrols their territory, which in a 20 gallon would be the rest of the tank. and make sure you have some kind of speacialized fry food, I use fry bites. then id feed them frozen krill when they get to about half an inch long, makes they're colors come out faster. its fun to watch them tear at it too. and you shouldn't have to separate them till they get bigger. cichlids are very good parents they wont harm them