Just got a new fry of platy this early morning. In reply to how sure i am about having a muppy i would say 100% due to the deformaty and the coloring of his tail. Exact match to my dragon guppy male, and the only green anywhere in my whole tank ever. I have never seen a platy or molly personally with green coloring. I no longer have any guppy left he was the last. High mortallity rate with its sickness and tempermentalness to temperature. Never had one live more than a year or two. I dont have any monster fish just tropical fish, molly, platy, tetra, cory, etc. I have two 120 gallon tanks and 4 ten gallon tanks. the 4 ten gallons are to keep a hospital and a breeding tank for each 120 gallon. I am letting my numbers dwindle enough to get into some monster fish but am still in the research stages.