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My Brother's tank has been having some problems lately, fish have been dying left and right. At first we noticed that their tails were deteriorating and looking ragged and torn up, then they were breathing hard from their mouths and finally we knew they were done for when we saw that some of their back halves had completely stiffened up. Their tails were completely gone and their back halves were almost completely white. They were still alive but just floating around inside the tank flapping their fins like crazy. Can you guys help me out?! What is this disease and how can we treat it?