As some of you know I've been breeding some fish (mollies and guppies right now) and I have a few 10g grow out tanks (to make sure they all get food). With about 20-30 fry growing out in it do I need to worry about upgrading the tank size once they get so big? They will be sold to the LFS. I know the concept behind an overstocked tank but I'm not having spikes and all the fish have room to swim (they vary in size from when they were born so there will not be a time when more than 20 of them are very large) but I don't want to get into a situation where the fish get stunted or anything. If I do need to move them to a larger tank before they'd be large enough to sell I can live with that I would just have to go buy it. I may be over thinking it a bit but that's why I ask you guys =)