The yellow coris wrasse is a bright canary-yellow, reef-safe Halichoeres wrasse that is active, hardy, and valued for eating pest invertebrates like flatworms and small bristleworms. Although sold as a 'coris,' it belongs to the genus Halichoeres and is far more peaceful and reef-friendly than true Coris species.
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Small to medium; about 10-12 cm (4-5 in) total length.
Lifespan
5–8 years
Social needs
solo
Native region
Indo-Pacific: eastern Indian Ocean to the western Pacific.
Origin
Old World
Climate
🌴 Tropical
Water type
🌊 Marine
Family
Labridae
Genus
Halichoeres
Part of the Wrasses
Wrasses (family Labridae) are an enormous, diverse group of active, colorful reef fish ranging from tiny fairy and flasher wrasses to large predators. Many sand-diving species sleep buried in the substrate, most are accomplished jumpers, and several are prized for controlling pest invertebrates in reef aquariums.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Sand-bed reef
55 gal / 200 L reef with sand
Halichoeres chrysus is a sand-diver — needs 5+ cm fine sand to sleep in. Eats flatworms and pyramid snails. Tight lid mandatory; they jump.
Photo coming soon
Recommended
Long mature reef
75 gal / 280 L+
More swim length and rockwork. Generally reef-safe but may eat ornamental shrimp. Feed varied meaty foods. Peaceful with most reef tankmates.
Photo coming soon
Ideal
Large mixed reef
125 gal+ / 470 L+ mixed reef
Spacious reef with deep sand and abundant rockwork. Full canary-yellow colour and natural patrol behaviour eating reef pests.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg
Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.
Photo coming soon
Fry
Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.
Photo coming soon
Juvenile
Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.
Adult
Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.
Habitat & enclosure
Provide a reef or fish-with-live-rock tank of at least 110-150 L (30-40 gallons) with open swimming room and plenty of live rock for grazing and shelter. Crucially, include a deep, fine sand bed of at least 5 cm (2 in), because this wrasse dives into the sand to sleep at night and to escape threats. Maintain reef parameters: temperature 22-27 C (72-80 F), salinity 1.023-1.026 specific gravity, pH 8.1-8.4, ammonia and nitrite 0, nitrate low. It is an active mid-water and substrate-level swimmer that needs room to roam.
Substrate
A fine, soft sand bed at least 5 cm (2 in) deep is essential so the fish can burrow to sleep and hide. Coarse gravel or crushed coral can injure the fish as it dives and should be avoided. Combine the sand bed with ample live rock for foraging and cover.
Equipment & setup
Standard reef life support: reliable heater, protein skimmer, and moderate flow. A tight-fitting lid covering all gaps is essential, as Halichoeres wrasses are strong jumpers and a common loss is finding them on the floor. No specialized equipment beyond the usual reef setup is needed, though a fine sand bed substitutes for any hiding caves.
Diet
Carnivore that grazes constantly on small invertebrates among the rock and sand: copepods, amphipods, small snails, flatworms, pyramidellid snails, and small bristleworms, making it a useful natural pest controller. Readily accepts prepared foods including frozen mysis, enriched brine shrimp, finely chopped seafood, and quality marine pellets. Feed two or three times daily, as its active metabolism burns through food quickly. A mature tank with a healthy microfauna population supplements its diet between feedings.
Behavior & temperament
Active, peaceful, and generally reef-safe, though individuals may occasionally pick at ornamental shrimp, tiny snails, or feather dusters. It is one of the more community-friendly wrasses and is usually safe with most fish, but can be mildly territorial toward other wrasses, especially conspecifics; keep one per tank unless the system is large. It buries in the sand to sleep and when startled, and is a notable jumper. Not a handleable fish. It will not bother corals.
Health
Hardy and disease-resistant once established, with the sand-diving habit giving it a refuge that reduces stress. Like all wrasses it can be sensitive during shipping and acclimation, so quarantine and watch for marine ich (Cryptocaryon) and velvet. A proper sand bed is a health requirement, not a luxury: without it the fish cannot perform its natural sleeping behavior and becomes chronically stressed. Ensure it is eating well before and after transfer, and acclimate slowly to avoid shock.
Tips, DIY & hacks
Always provide a deep, fine sand bed before adding this fish. Cover every opening in the lid to prevent jumping. Feed multiple small meals a day to match its high activity level. Use it deliberately as a natural control for flatworms and pyramidellid snails, but watch prized ornamental shrimp and small snails. If acclimating to a new tank, dim the lights and minimize disturbance so it can find a spot to dive and settle.
