Oh. Well if you are concerned about the fish, you should tell the owner my advice. Hopefully it's not a parasite because if it is, the fish can die. Usually fish won't die from a swim bladder disorder. Peas can't hurt though. That will at least rule out the swim bladder disorder as an option. No sense in treating for parasites if it's not a parasite.
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Phishie

"An ounce of prevention is worth a pound of cure."