So, I just got what I thought was 3 female Mollies and one male but after close inspection the male turned out to be a female. Should I take her back to the store and exchange her for a male or just keep her and go purchase a male. I have a 15gal tank with 2 female Guppies and now the 4 Mollies will adding a 5th Molly be to many fish? I was also thinking about adding 3 Cory Catfish in a couple weeks. Will that be to many fish with the 4or 5 Mollies or should I add less Cory's or none at all? All suggestions are much appreciated.