I have 12 baby platy's that are two months old now...getting big and they seem to be happy, hungry all the time. They are currently in a 10 gal and I've read that 4-6 are ok too keep in a 10 gal. How long until they will overcrowd each other? I have a 30 gal w/ other platy's, tiger barbs, and a purple chiclid but I don't want to put them in there too soon and have the chiclid eat them. Thanks