Can't identify if illness or just stress
I have a platy who I am not sure is diseased or just stressed. Her fins and tail are continuously closed into her body. the best way to the describe it is that she looks cold.
I have looked at a number of sites and can't find anything that approximates her problem. Other than her "skinny" condition she looks normal. It is possible that the scales on her underside are a bit rough - sort of sticking out a little, but it is slight and I can't say for sure whether this is new or not.
I have many other platies and all the rest seem fine. there have been no new introductions to the tank in months.
Oh, and I have checked the parameters and every is fine... the Ph was a little low, and I know platies don't like that, but it wasn't very low and everyone else seemed fine.