Citron Butterflyfish

Geographical Origin and Habitat: Tropical Indo-Pacific, distributed from East Africa to the Hawaiian and Tuamotu Islands, north to southern Japan, and south to Australia. Inhabits shallow lagoons and sandy reef flats. They prefer shallow lagoons and exposed seaward reefs rich in coral growth and algae.

Taxonomy and Morphology: Member of the family Chaetodontidae. Features a deep, laterally compressed body with a slightly pointed snout specialized for picking benthic prey. Their compressed body shape allows them to navigate easily through dense branching corals.

Social Behavior: Peaceful and active species. Typically observed in mated pairs or small groups. Constantly searches reef flats for food, requiring a stress-free environment. They are active swimmers that usually live in pairs, defending their feeding territory together.

Coloration and Sexual Dimorphism: Pale lemon-yellow to cream-colored body. Dotted with numerous small, dark blue to purplish spots arranged in diagonal rows. A black vertical band masks the eye. The bright yellow base color with brown spots provides effective camouflage against sandy backgrounds.

Aquarium Setup: Requires a mature marine aquarium of at least 250 liters with plenty of live rock to provide hiding spots and natural grazing surfaces. A large aquarium with strong water flow and high dissolved oxygen is essential for their health.

Diet and Feeding: Omnivorous. Feeds on algae, coral polyps, and small invertebrates. In captivity, accepts dry pellets, flakes, frozen brine shrimp, mysis, and marine algae. Offer a specialized diet containing marine algae, vitamin-enriched frozen foods, and coral-specific pastes.

Water Quality: Maintain standard marine parameters: temperature 22-27 °C, pH 8.1-8.4, and salinity 1.020-1.025 with efficient filtration and moderate water movement. Maintain pristine water conditions with low nutrient levels to prevent systemic infections and stress.

Compatibility and Cohabitation: Highly peaceful. Not reef safe as it may nip at stony corals. Best kept with quiet, non-aggressive species in a fish-only setup. They are not considered reef-safe as they will feed on anemones, zoanthids, and coral polyps.

Aquarium Breeding: Spawning in home aquariums is undocumented. Pelagic spawner. The larvae float in the water column before settling onto the reef. Captive breeding is currently unsuccessful due to the planktonic nature and feeding requirements of the fry.

Risks and Diseases: Moderately delicate. Susceptible to marine ich (Cryptocaryon) and stress. Ensure the aquarium is fully cycled and stable before introduction. Quarantine new arrivals carefully to treat potential infestations of marine ich or skin flukes.