looks like a swim bladder problem. Could be a direct effect of the antibiotics and the good bacterias inside the fish intestine.
I would never treat with antibiotics unless it is 100% sure it is a bacterial disease. Most of the time it is a parasite that is causing the problem and it is better to treat with a broad spectrum medicine like Seachem Paraguard.
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More fish die from human stupidity than any other disease...
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