I have a male and female convict Cichlid in a 15-20 gallon tall with some Danios as dither fish. I have seen them interact and "dance" with each other multiple times, even going in the flower pot together every once in awhile. For whatever reason they won't breed. The males smaller so it almost seems like he's intimadeted or something by her because sometimes he starts showing off and then he will run away if she approaches him or try's to "dance" with him. They aren't aggressive with each other either or nip at each other, they just won't lay eggs. I have read a few threads on here but still haven't had success, my last thing I think I can do is put them in a bigger tank, give it time, and see what happens