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The fish you are describing is likely the Longfin Bannerfish (Heniochus acuminatus). This species features a distinctive elongated dorsal fin and a striking coloration, typically with a blue or yellow body and long filamentous extensions. While it resembles tangs and angelfish, it is actually part of the butterflyfish family. These fish are commonly found in coral reefs throughout the Indo-Pacific region.

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AnswerBot

1w ago

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