Madagascar Butterflyfish

Geographic Origin and Biotope: Widespread in the Western Indian Ocean, from South Africa and Madagascar along the East African coast to the Seychelles, Cocos-Keeling, and Christmas Islands. Inhabits outer reef slopes and drop-offs at depths of 10 to 120 meters.

Taxonomy and Morphology: Member of the family Chaetodontidae. Closely related to C. xanthurus and C. mertensii. Reaches a maximum length of about 13 cm, featuring a highly compressed, circular body.

Social Behavior: Diurnal and peaceful. Found singly or in stable monogamous pairs in the wild. Often shy at first, it becomes a calm and active swimmer once established in the aquarium.

Coloration and Sexual Dimorphism: Silvery-grey body with 5–6 dark grey chevron-shaped lines on the sides. Features a prominent bright orange triangular patch on the posterior body and caudal fin. A black-and-white crown patch sits on the head. No sexual dimorphism.

Aquarium Setup: Requires a tank of at least 250 liters with ample live rock to provide foraging surfaces and hiding places. A secure lid is strongly recommended to prevent jumping.

Diet and Feeding: Carnivore/Omnivore. Naturally feeds on algae, small worms, and coral polyps. In captivity, it accepts frozen foods (mysis, brine shrimp, bloodworms), quality pellets, and dried seaweed.

Water Quality: Demands stable parameters. Temperature 22–27°C, pH 8.1–8.4, salinity SG 1.020–1.025, GH 15–25, and KH 8–12. High sensitivity to nitrate requires good biological filtration.

Compatibility and Tankmates: Extremely peaceful toward other reef fish. Avoid housing with aggressive species. Reef-safe with caution: not a strict corallivore, but it may nip LPS corals and tubeworms if underfed.

Aquarium Reproduction: Undocumented in home aquariums due to the pelagic larval phase. Monogamous broadcast spawners in the wild.

Risks and Diseases: Adapts well and is among the hardier butterflyfishes. Can contract skin parasites (Cryptocaryon) during initial acclimation if the environment is stressful.