Acanthurus leucosternon
The Powder Blue Tang is widely regarded as one of the most beautiful tangs, boasting a sky-blue body, crisp white chest, jet-black face mask, and a yellow dorsal fin. Native to the Indian Ocean, it needs a large tank (at least 100 gallons) and pristine water conditions. It can be aggressive toward other tangs and is somewhat ich-prone, best kept by experienced hobbyists.
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