I have a 55 gallon tank that I have put live bearers in, guppies and platys. I started with around 8 adult platys and about the same on guppies. After about 4 months I have alot of fry in the tank. When do you think I should get concerned of over population? I am having a great time raising them and it has also been wonderful for my kids to see. But, I also know that I don't want to let it get out of hand. I have a new lfs here in town that made a comment of having someone local to get fish from would be beneficial to her. So that may be an avenue. But the fish have to get big enough before I can let them go. Any advice would be greatly appreciated.