My wife just noticed one of our male platy's floating around in the current of our 55 gallon community tank. He is still normal sized, no external damage but his body is bowed and stiff. He can't control his tail but his fins are all moving and his gills work. I put him in my hospital tank but I don't know what to try and treat him with. Anyone know what type of problem this is? can it spread and if so, how can I treat my tank to keep the other fish from catching it. None of the other platies or mollies seem to have any problems. Kyle