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Acanthurus coeruleus

We nicknamed all the Surgeonfish 'happy fish' as they look as though they are smiling. The Blue Tang is sometimes dark with royal blue fins, sometimes all one shade of blue, and sometimes two shades of blue. They are seen everywhere on the reef, singly, in pairs or in groups feeding low on the reef.The juvenile is brilliant yellow with blue eyes. As it matures, the outer rim of the fins turn blue - a very pretty fish.