My female platy had fry that tomorrow will be three weeks old. I have them in a seperate tank right now, but i dont know when to put them back in with the adults. right now in the tank i have 3 female mollies, 3 female platties, 1 male molly, and 1 male platty. they are in a 29 gallon tank just the eight of them. my momma say that we will put them in a breeder net in the big tank. is that the right thing to do?? HELP!!