Cass chose Mollies for some of her first fish. The fat Molly that she chose from the pet store wasn't fat, it was pregnant. We now have about ten Molly fry separated in a net breeder. There were probably quite a few more, but the other fish had a hardy snack. If I was confident that we would keep all of our other fish alive, I would let nature take its course. As of now, I think we'll use them as our tank replenishment program. Of course, I'm assuming that we can keep the fry alive.