Currently I have two pregnant guppies in their own tank which is a 10 gallon, cycled tank with a HOB and mid-size gravel. Now, I have a second tank that has no plants, an HOB, same-size gravel, some fake plants (will be adding real ones tomorrow) and three male red platys. I plan on having one of the tanks be a QT but of course right now it's being used as a breeder tank. The thing is, I heard that platys and guppies can interbreed... So that means that I will have more fry which I DO NOT WANT. I thought I would ask for confirmation: Is it true that platys and guppies can interbreed?