My platys had babies and I was able to catch three of them and place them in a breeder container inside my regular tank. How long do I have to leave the fry in this separate container? I have a betta and three platys in the big tank, and I do not want to release them too early for fear of the bigger fish eating or picking on them. Also, one of the babies seems to be growing faster than the rest. What can I do to make the others catch up?