Adorned Wrasse - Halichoeres cosmetus

Adorned Wrasse (Halichoeres cosmetus)

The Adorned Wrasse, Halichoeres cosmetus, is a colourful and active marine wrasse, admired for its attractive lined patterning, lively swimming behaviour and useful natural foraging around the rockwork. Also known as the Orange-Lined Wrasse or Cosmetus Wrasse, this species is a popular Halichoeres wrasse for mature reef aquariums, where it will spend the day searching for tiny foods, pests and small invertebrates. It is generally hardy once settled, but it does require a soft sand bed, a secure lid and careful tank mate selection.

Common Name:
Adorned Wrasse, Orange-Lined Wrasse, Cosmetus Wrasse, Decorated Wrasse.

Scientific Name (Latin):
Halichoeres cosmetus

Maximum Size:
Around 12–13 cm, making it a medium-sized but active wrasse that needs good swimming space and mature rockwork.

Water Type:
Marine

Origin / Natural Habitat:
Found across parts of the Western Indian Ocean, including reef regions around East Africa, South Africa, the Seychelles, Mauritius, Réunion and nearby island reef systems. In the wild, Adorned Wrasse are associated with shallow coral reefs, rocky reefs, lagoon areas, outer reef slopes, mixed coral zones and rubble habitats. They are usually seen singly or in small loose groups while moving over the reef in search of small foods.

Water Parameters:
Temperature: 24–27°C
pH Range: 8.1–8.4
Hardness or Salinity: SG 1.020–1.025

Temperament:
Peaceful to semi-aggressive. Adorned Wrasse are usually manageable in mixed reef aquariums, but they can become assertive once established, especially towards very timid fish, small passive wrasses or newly introduced similar species. Best kept with peaceful to moderately robust marine fish that will allow them to settle, feed and display naturally.

Diet:
Carnivorous micro-predator. In the wild, this species naturally hunts for small crustaceans, worms and tiny reef animals among rockwork, rubble and substrate. In the aquarium, offer a varied diet including frozen mysis shrimp, enriched brineshrimp, cyclops, copepod-based foods, finely chopped clam, mussel, prawn and high-quality small marine pellets. It may also pick at some common reef pests, but should not be relied upon as the only pest-control method.

Minimum Tank Size:
A practical minimum of around 250–300 litres is recommended for a single specimen, with larger aquariums preferred for mixed wrasse communities. Provide mature live rock, caves, rubble zones, open swimming space and a soft sand bed deep enough for burying.

Behaviour & Activity:
An active daytime wrasse that spends much of its time cruising around rockwork, inspecting crevices and picking at small foods. Like many Halichoeres wrasses, it buries itself in the sand at night, when frightened or during the settling period. Newly introduced specimens may hide in the sand for a short time while adjusting. A tight-fitting lid is essential, as wrasses are strong jumpers when startled.

Reef Safe:
Reef Safe
Adorned Wrasse are generally considered safe with corals and do not normally nip coral tissue or clam mantles. However, they may eat small ornamental crustaceans, fan worms, tiny snails, flatworms, pods and other small mobile invertebrates. They are best described as reef safe with caution because they are suitable for coral reef aquariums, but not ideal where very small ornamental invertebrates are a priority.

Special Requirements or Care Notes:
Best kept in a mature aquarium with a soft, fine sand bed for sleeping and stress response. Avoid bare-bottom systems or sharp, coarse substrate that could damage the fish when it buries. Provide plenty of rockwork for grazing and visual breaks, and use a secure jump guard. Introduce with care if other Halichoeres wrasses are already established, as territorial behaviour can occur. Monitor feeding closely during the first week, especially if the fish hides after introduction.

Suitable for:
Intermediate fishkeepers

Availability:
Regularly available in the marine aquarium trade / Availability can vary depending on supplier, size, sex, colour phase and import season

All images are a visual representation of the fish you will receive, made to be as accurate as possible. Please note that Mother Nature is a wonderful thing, and variation in patterns and colours will occur — that is part of the unique beauty of these animals.