I run a small pet shop and recently had someone come in (willing to argue their point) and inform me that "lyre-tail mollies are a hybrid of swordtails and mollies". I was not aware that this was even possible. I have heard that mollies and guppies can breed and the same for platies and swordtails, but never that swords can breed with mollies. Help? I am asking this question more to gain information that to argue a point. I try to be as informed as possible on the fish I sell and would rather dissuade someone from buying a fish than sell them a fish that will do poorly in their set-up.