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Coradion melanopus. Coradion melanopus, known commonly as the twospot coralfish, is a species of marine ray-finned fish, a butterflyfish in the family Chaetodontidae. It is widespread throughout the tropical waters of the central Indo-Pacific region, from Indonesia to the Philippines. The twospot coralfish is a small size species which attains a maximum size of 15 cm length. It is a cautious species which inhabits sheltered lagoons or exposed outer reefs where it feeds on sponges, especially along drop offs. It forms pair to breed.