I have 2 small Ryukins, I woke up this morning and one of them was floating around in the tank. It is still alive, but only moves it's fins once in a while. It seems to be a swim bladder problem. I put the fish in a separate tank, raised the water temperature and am starting to fast it. It is very bloated and not doing well. Please help!

If its still eating, try giving it some blanched peas with the shell removed.

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Any kind of pea will work, just squeeze it a little so the insides begin to squeeze out. Hold it up to his mouth and he should eat it. I would do this until you have gotten at least 2 peas down. Then squeeze one into the bottom of the tank. When the first two peas begin to work, he will be able to swim down and eat the last pea. You may want to continue to fast him for a few days, to monitor him, and then he should've safe to move back into he tank. Good luck, and BE PATIENT!