It's quite possible for them to cross breed but mostly they'll turn out ugly
Not all cross breeds are ugly. My friend has a cross breed and it's stunning. It's the size of a Molly with a orange, blue and white guppy tail, but the body of the fish is black, it's beautiful. But if you are trying to get good looking guppies desperate the Molly's and guppies because the male guppies will have a go with the female Molly's to
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Thats why I said mostly, not all...
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