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Originally Posted by Dentoid  Maybe it was a gas bubble in his swim bladder. |
If it was a problem with his swim bladder, the fish would have abnormal swimming postures. Usually, they can't "right" themselves, and sometimes you'll find them wedging into rocks.
bluespotjawfish - have you seen the fish poop yet? How is the abdomen looking? Just for reference, here is some info for you:
Internal infections. You might also think about getting a dewormer, in case worms are the problem. As examples, Prazi-pro is a praziquantel product that you can buy, and Ultra Cure PX contains praziquantel and metronidazole, too.