As hard as it is to say Lepomis is quite right athat it is rare for them to recover. Sometimes I have to take fish in this condition out of the tank incase it is disease, often I have to humanely put them down. It is a hard decision to make, but I feel I have to be fair to the other fish. It could be due to some disease that I can't diagnose and it is better to get them out of the tank.
Sometimes weak specimens succumb to stress very easily.
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