You should have at least 3 or 4 females for each male, otherwise the male will harass them to death.
A 10 gallon tank wont' hold many fish. Four adult platies is plenty, so you'll have to keep numbers down.
IF you don't get rid of the snails they will have a population explosion and your tank will be literally covered in them, even though the fish usually will eat some babies.
Yes, fish stores will take your babies as a favour, but don't expect to get paid much for them, if anything at all. If you're lucky, they might give you a small credit. As you see, platies breed non-stop and are readily available!
Last edited by Lucky Rescue; July 18th, 2005 at 06:28 PM.