| sounds like swim bladder dysfunction-is he able to maneuver well enough to eat? are there other fish in the tank? did a quick search on google and it appears as though the swim bladder can be damaged when jostled excessively in transit or when placed in water without proper acclimation among other things....some fish develop it from a bacterial infection, which apparently is fairly contagious--don't think there is a fix for those that have traumatic injuries...if he appears ok, and you don't have any luck with antibiotics, you still may have to consider putting him down if he can't seem to navigate well enough to eat or otherwise maintain a quality of life.... best luck, let us know how he does--
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