Surgeonfish and Unicornfish (Acanthuridae) - My Hawaiian Images
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Ah, grazing time! A school of Convict tangs (Acanthurus triostegus) polishing algae and other edibles off the bottom...these tangs will form into massive rolling schools that keep the corals algae-free...and every now and then will seriously disturb nesting damselfish by eating their eggs as well.

tangconvict tangacanthurus triostegusAcanthuridae