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What tankmates does he have? Do you have the ability to move him to a quarantine tank?
That looks as though it may be a bacterial infection. Keep a sharp watch on it, and see if you can source the "triple-threat" antibiotics: Kanaplex, Metroplex and Furan-2 work well together, targeting a wide variety of bacteria.
~Bruce
Like @Maritimer said, hit it with the trifecta as listed in his original post, it works wonders. All 3 are usually readily available on Amazon prime if you don't have a local pickup option.

