What do you get when you cross a Guppy with a Molly? No, that’s not a joke. A lot of people aren’t aware that different livebearers can interbreed. They fall into two groups. Mollies, Guppies, and Endlers can breed to produce offspring. Platies and Swordtails can breed to produce offspring as well. I pulled the bonehead move of leaving on male Guppy in my community tank with my female Mollies. Even though I knew that cross breeding was possible, I thought they male Guppy was way to small to mate. Well, this is what I have now.

Here are the fry from a male Guppy and female Molly.

Unfortunately, while Guppies and Mollies can cross breed, the offspring are generally sterile, deformed, and do not make it to adulthood. The fry look normal after about a week and have healthy appetites, but it’s often hard to see deformities in fry until a few weeks after birth. Time will tell how these little fellows do.