You are the experts, you tell me if it's a losing battle. I have a runt discus that the bigger guys kept away from the food...he began to look thin, and I discovered him trying to swim upright and not making it...floated to the bottom and kept trying to right himself. I moved him to a hospital tank and supplied him with food, but he wont eat. Is he too far gone..? He looks skeletal, but is swimming ok now. Any advice?