Tanaka's Pygmy Wrasse

Geographical Origin and Habitat: Central-Western Pacific, mainly known from Indonesia, Philippines, and southern Japan. Inhabits deep caves and crevices of coral reefs.

Taxonomy and Morphology: Labridae family, genus Wetmorella. One of the smallest wrasses, reaching 6 cm (2.4 inches). Compressed reddish-brown body with white stripes and dark ocelli.

Social Behavior: Extremely shy and elusive, spending most of its time hidden inside rock caves or crevices, swimming with a characteristic hovering motion.

Coloration and Sexual Dimorphism: Reddish-brown body with two vertical white bands and prominent black ocelli (eyespots) ringed in white on the dorsal and anal fins. No obvious sexual dimorphism.

Aquarium Setup: Requires an aquarium of at least 60 liters with a massive amount of live rock arranged to form mazes, caves, and dark crevices. A secure lid is mandatory.

Diet and Feeding: Carnivorous. Naturally feeds on benthic micro-fauna. Feed with small frozen crustaceans like copepods, baby brine shrimp, mysis, and finely chopped foods.

Water Quality: Stable temperature 23°C - 27°C, stable pH 8.1 - 8.4, salinity 1.020-1.025, KH 8-12, GH 15-25. Gentle, regular filtration.

Compatibility and Cohabitation: Peaceful and shy. Keep only with small, docile tankmates (gobies, micro-fish). Easily bullied or outcompeted for food by active, fast-swimming species.

Aquarium Breeding: Protogynous hermaphrodite. Aquarium reproduction has not been documented due to the species' reclusive habits and shyness.

Risks and Diseases: High risk of starvation if housed with aggressive feeders. Prone to jumping out of the tank if startled by sudden movements outside the aquarium.