it probably wont be long till they bread. You can try and sell the fry but you wont get much for them convicts are often called the mice of the aqurium becuase the mutiply like crazy. Ive heard of broods of fry being well above 500 even 1000 sometimes thats alot of babies. I really dont think you should have any trouble getting them to mate though convivts are about the easiest cichlid to get to mate. Good luck and have fun. BTW if you have an occar in there with them then most of the fry will be gobbled up by him.