Marking in this photo are in the fishes tail. This type of mark happens on my chocolate relatively often and disappears within a day or two and may show up somewhere else on the fish. I do occasionally have carbon in the tank but small amounts and not for extended periods. It eats like a pig, seems otherwise perfectly happy but i am just wanting to make sure i am doing the best for this fish. Only other tang is a convict and i havnt noticed any spots or marks ever. If the convict gets much fatter i might have to put it on ozempic.
Also, the white spots in the picture are just particles in the tank, none actually on the fish.

Also, the white spots in the picture are just particles in the tank, none actually on the fish.

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