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Mr. Mound Coral is, well, a mound coral, and a main antagonist that appears in the musical special, Octonauts and the Great Barrier Reef. He protects his space by using his sweeper tentacles. At first, he thought the Octonauts are taking over his space, but they are not. Mr. Mound Coral also sang the song "Trouble on the Reef". Despite being referred to as a Mound Coral, he resembles a Bubble Coral more

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