Three-spot Angelfish

Geographic Origin and Biotope: Widespread throughout the tropical Indo-Pacific, from East Africa and the Red Sea to Samoa, north to southern Japan, and south to Australia. Inhabits outer reef slopes, clear lagoons, and drop-offs at depths of 3 to 60 meters.

Taxonomy and Morphology: Member of the family Pomacanthidae. Grows to a maximum length of 26 cm. Features a compressed oval body, large scales, and a small mouth equipped with rows of brush-like teeth.

Social Behavior: Diurnal species, usually found solitary or in pairs. Exhibits moderate-to-strong territoriality as it matures, especially toward other angelfish species.

Coloration and Sexual Dimorphism: Features a brilliant yellow body with electric blue-to-purple lips. Has three distinct black markings: one spot on the forehead and two behind the head. The anal fin is bordered in broad black. Juveniles lack the adult head spots. No obvious sexual dimorphism.

Aquarium Setup: Requires a large aquarium of at least 450 liters with vast open swimming spaces and sturdy live rock structures. A tight-fitting lid is necessary to prevent jumping.

Diet and Feeding: Omnivore/Specialized feeder. Feeds primarily on sponges and tunicates in the wild. In aquariums, it must be offered high-quality frozen foods, spirulina, nori, and sponge-enriched angelfish diets.

Water Quality: Demands stable parameters. Temperature 23–28°C, pH 8.1–8.4, salinity SG 1.020–1.025, GH 15–25, and KH 8–12. High sensitivity to nitrate and organic wastes.

Compatibility and Tankmates: Semi-aggressive as an adult. Best kept as the sole angelfish in the system. Not reef-safe: it will likely nip at LPS, SPS corals, sponges, and clam mantles.

Aquarium Reproduction: Extremely difficult in home aquariums. Cultured commercially on a small scale by specialized facilities.

Risks and Diseases: Dietary transition of wild-caught specimens can be highly challenging. Prone to marine ich (Cryptocaryon) and skin infections if stressed or water quality is poor.