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The Acanthuroids comprise several large and importand tropical reef fish families which are mostly herbivorous. They include the fishes popularly known as surgeonfishes or tangs, unicorns, sawtails, the Moorish Idol, and rabbitfishes. Many members of these groups help to keep in check the fast growing algea that does especially well on sunny, shallow reefs, preventing these coral reefs from becoming overgrown. An indispensable guide:
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