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ccCapt might be right, but it's a bit hard to tell from your photos. The second photo seems to show several narrow dark bands on the body. If these are present (and if it is indeed from the Atlantic), I'd say it's a doctor fish (Acanthurus chirurgus).
Ive caught these fishing many times biggest ive seen is about the full size a blue tang .. supplements should be same..we just dont see these on the aquarium trade because thier dull color.