Coral Margin Butterflyfish

Coral Margin Butterflyfish (Chelmon marginalis) Care Level: Moderate Temperament: Peaceful Colour Form: Yellow, White, Black Diet: Carnivore Reef Compatible: With Caution Water Conditions: sg 1.020-1.025, 24-28°C, dKH 6-12, pH 7.8-8.4 Max. Size: 18 cm Family: Chaetodontidae Minimum Tank Size: 300 litres Overview The Coral Margin (Chelmon marginalis) is a strikingly beautiful and lesser-known species of butterflyfish, often confused with its close relative, the Copperband Butterflyfish (Chelmon rostratus). Native to the waters of Australia and New Guinea, this species is recognizable by its long, slender snout and distinctive coloration: a pale yellow body with vertical white bands and a prominent black margin on its fins, giving it its name. The Coral Margin is popular among aquarists for its unique appearance but requires specialized care, making it more suitable for experienced hobbyists. Habitat & Behaviour In the wild, the Coral Margin inhabits coral reefs and lagoons, where it uses its long snout to pick at small invertebrates from crevices in the rock. In the aquarium, it is best housed in a well-established tank of at least 300 litres with plenty of live rock for foraging and hiding. It is a peaceful species that generally coexists well with other peaceful tankmates, but it may become territorial with other butterflyfish or similar species. When considering adding this fish to a reef tank, caution is advised, as the Coral Margin may nip at corals and sessile invertebrates, particularly feather dusters and tube worms. Diet The Coral Margin can be a challenging feeder, especially when first introduced to an aquarium. Its natural diet consists mainly of small invertebrates, including worms, crustaceans, and mollusks. To encourage feeding, offer a varied diet of live foods such as blackworms, brine shrimp, or mysis shrimp. Over time, it may adapt to frozen or prepared foods, but patience and persistence are key. Adding clams on the half shell or seaweed strips can also entice feeding. Summary The Coral Margin is a visually striking species with a peaceful demeanour, making it an attractive choice for larger, well-established marine aquariums. However, it requires an experienced aquarist who can provide the appropriate environment and diet. With proper care, the Coral Margin can be a captivating and rewarding addition to the right setup.