Please help! I have had my fish for over a year now, sucessfully, with no sickness. I have a 20 gal tank with one female molly, one male platy, and one female platy. The female platy was a fry that I raised from birth. I woke up this morning to feed my fish and the female platy is completely burst open on the side with a whole bunch of white stringy stuff floating in the water. I am assuming these are her intestines. I know there is probably no saving her, but I would like to know what to do and how to prevent this from happening. A long time ago, on a much smaller scale, this happened to another platy of mine. Thank you.