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Is it possible for a mollie to breed with a swordtail or a platy? Just asking because one of my friends refuses to mix them because he thinks they can breed together.
Nope. Mollies and platies/swordtails cannot breed together because they are of different genus. Mollies and guppies can breed, as can platies and swordtails.
So what u guys are saying is that it is physically impossible for this to happen or just unlikely? Or do you mean that if it did the offspring would be sterile?