i came home tonight to find my biggest female platy struggling for life stuck to teh filter in teh back of my tank. She was swimming around happily eating when i fed the fish and all that not but 5 hrs ago. I got her off the filter and her fins have been reduced to nubs and she has a large patch of scales missing on her tail. She is still alive and breathing but not moving. Whats wrong and what should i do to help her. Its a ten gallon tank and im pretty sure all the water is normal because all the other fish seem fine. the only tank mate that could have hurt her at all is the red tailed shark but i dont think he could have done all that damage.