Mystery Wrasse

Mystery Wrasse

The Mystery Wrasse (Pseudocheilinus ocellatus) is a striking, secretive reef wrasse — its lavender-to-pink body finely barred and tipped with a yellow head and an eye-catching ocellus near the tail. A close relative of the popular sixline wrasse, it is hardy, long-lived and reef-safe, and it shares the genus's useful habit of hunting small pest invertebrates. Its beauty, manageable size and pest-control value make it a sought-after fish for reef aquariums.

It is bold and active for its size, with a bit of attitude toward other small wrasses, so a little planning around its temperament pays off.

Natural Habitat & Origin

Pseudocheilinus ocellatus is found on Indo-Pacific reefs, often at deeper levels and around rich coral and rubble, where it darts between cover hunting tiny crustaceans and other small invertebrates. It is a secretive fish that stays close to structure.

In the aquarium it wants plenty of live rock with crevices to explore and shelter in, ideally in a mature system with natural microfauna.

Care Requirements

Maintain stable marine conditions: salinity around 1.024–1.026, pH 8.1–8.4, and a temperature of about 24–26°C (75–79°F). Reaching about 12 cm (5 inches), it suits a tank of around 115 litres (30 US gallons) or more with abundant rockwork. A secure, gap-free lid is essential — like most wrasses, it is a jumper. It is hardy and adaptable once settled.

Diet & Feeding

The Mystery Wrasse is a carnivore, feeding on small crustaceans and invertebrates in the wild — including pest species such as small bristleworms and pyramidellid snails, which makes it useful in a reef. Offer a varied diet of frozen mysis and enriched brine shrimp, finely chopped seafood and quality marine pellets, fed once or twice a day.

Behavior & Temperament

This is a semi-aggressive fish, generally peaceful toward unrelated species but assertive toward other small wrasses and similar fish that compete for its niche. It is best kept as the only small wrasse in most tanks, and added later in a stocking plan. It spends its day busily working the rockwork.

Tank Mates

Good companions are a wide range of peaceful to semi-aggressive reef fish — tangs, clownfish, gobies, larger wrasses and similar. Avoid keeping it with other Pseudocheilinus or similar small wrasses in a small system. It is reef-safe with corals and ornamental invertebrates, though as a small predator it may eat tiny shrimp along with the pests it controls.

Breeding

Pseudocheilinus ocellatus is a pelagic spawner and is not bred in the home aquarium, so trade specimens are wild-collected.

Common Health Issues

The Mystery Wrasse is hardy but, like all marine fish, can be affected by marine ich (Cryptocaryon irritans) and marine velvet (Amyloodinium ocellatum), particularly when stressed. Quarantine new arrivals, keep water quality stable, and secure the lid against jumping. Given a tank with plenty of rockwork and a varied diet, it is a hardy, beautiful and genuinely useful wrasse for a reef aquarium.