I have a 50 gallon aquarium that has one kissing gurami, one angelfish, 4 zebra danios, 4 Cory Cats, 2 sword tails, a green lantern platy and her baby. Yes this tank is over stocked but this was all given to me by a friend moving and in my apartment I can’t upgrade, there is no room! When I move in the summer I am upgrading. This is not the point of my story however. I have owned these fish since September. Then my Platy became fat. A few weeks later I saw a fry which has been thriving since, I just assumed it was a Zebra Danio fry. It’s not! It has grown a lot and it’s a platy!! How? My green lantern platy is the only platy, so I called the original owner and she said she has never owned another platy. What happened? I don’t understand this. Can someone explain!