My calico platy's of which i have three, do not appear to be doing very well. I moved house last month, and thanks to all the advice I recieved here, no casualties at all. They are actually at my parents house as we are getting our house re-wired and it is all a bit to chaotic here for them at present. Anyway, back to the point, two weeks after the move, the smaller most submissive platy started to clamp its fins, although it still is feeding and seemed quite active. I was then on holiday for a week, and have now returned to find that it looks awful. It looks as if the muscle has just wasted away, its body is kind of bent (tail down) and it swims mainly with its lateral fins (not sure of correct name), it hardly uses its tail at all. I work at a vets, and one vet suggested that it could be a mineral deficiency but they are fed a varied diet, and I checked they were being fed enough. Another platy is also starting to show similar symptons, clamped tail and fins, but still good body condition. Because another fish seems to be suffering, I suspect it must be either contagous, or something in the water or diet affecting them. Water tests show all is fine, and other fish all look very healthy. The two ill fish are both still actively feeding and responsive. The first platy is more lathargic, but with no muscle, who can blame it. Any help or idears would be much appreciated. I expect the first platy will die, but I am actually thinking of ending its wasting life, as I can't bear to see it the way it is right now.