Is this play tb? I had 2 other platies that died months ago after looking the same way. I have treated the tank with general cure and for parasites. All my cories died but at different times and never seemed to have anything wrong with them (except one). Her and her baby are the only platies I have left and now she looks like this. I tested the water yesterday and ammonia and nitrites were 0 and nitrates were 5. I run 2 filters, it's a 29 long and I do weekly water changes. I also have 3 guppies and 6 glofish danios. I have had them for months and none of the danios have died. I have lost 2 guppies. I'm stumped is there aonethsom else I can test for or is it just something that happens to platies?