Brian Greene's Fairy Wrasse

Geographical Origin and Habitat: Cirrhilabrus briangreenei is native to the Western Central Pacific Ocean, specifically endemic to the Philippines, with significant collections occurring within the Verde Island Passage. This species inhabits deep mesophotic coral reefs, typically found at depths ranging from 40 to over 110 meters. In these deep environments, sunlight is highly filtered, and the water remains cool, clean, and swept by moderate currents.

Taxonomy and Morphology: A member of the family Labridae (wrasses) and the genus Cirrhilabrus (fairy wrasses). It features a slender, fusiform body shape with large eyes developed for navigation in low-light conditions. The dorsal fin of the male is highly ornate and displays geometric color patterns. Adults reach a maximum size of approximately 7.5 to 9.0 centimeters in total length.

Social Behavior: An active swimmer that spends most of its time in the middle of the water column. It is a peaceful, schooling fish that naturally lives in harems containing one dominant male and multiple females. Males are generally peaceful toward other reef fish but will defend their territory against other males of the same genus or wrasses with similar appearance.

Coloration and Sexual Dimorphism: The coloration of mature males is spectacular, showing a brilliant red dorsal region that transitions into a golden-yellow on the flanks, a white belly, and electric blue trim on the fins, with a prominent dark markings pattern on the dorsal fin. Females and juveniles are less colorful, showing a mostly pinkish-orange body with shorter fins and simpler markings.

Aquarium Setup: Requires an aquarium of at least 250 liters (approx. 65 gallons) with ample open swimming space and plenty of live rock arranged to form caves, overhangs, and shaded retreat areas. Given its deep-water origins, moderate or dimmable lighting is preferred, or at least plenty of dark caves. A tight-fitting lid or mesh cover is absolutely mandatory, as this wrasse is a powerful jumper when startled.

Diet and Feeding: A zooplanktivore that requires multiple small feedings throughout the day due to its active nature and fast metabolism. The diet should consist of high-quality frozen foods such as mysis, calanus, enriched brine shrimp, and fish eggs. Once acclimated, they will readily accept high-quality marine flakes and small pellets.

Water Quality: Demands clean, highly oxygenated water with stable parameters. The water temperature should ideally be kept on the cooler side of the tropical spectrum, between 21°C and 25°C. Maintain pH at 8.1 to 8.4, specific gravity at 1.023 to 1.025, and low nutrient levels (nitrates/phosphates) through effective protein skimming and regular maintenance.

Compatibility and Cohabitation: Excellent reef-safe addition, as they do not bother corals, clams, or small ornamental shrimps. They cohabitate well with other peaceful reef species such as anthias, gobies, cardidals, and non-aggressive tangs. Do not house them with aggressive species like dottybacks or territorial damselfish that may bully them.

Aquarium Breeding: Spawning in home aquariums is not documented. In nature, they are protogynous hermaphrodites, meaning they begin life as females, and the dominant individual in a group transitions into a male. Courtship involves highly active swimming displays where the male dramatically intensifies his coloration to attract a female.

Risks and Diseases: The primary risk is jumping out of the aquarium, which will happen if the tank is uncovered. Stress from aggressive tankmates can cause the fish to hide constantly, leading to starvation. They are moderately hardy but can contract marine ich (Cryptocaryon) if stressed or exposed to poor water conditions.