Radiant Wrasse
Halichoeres iridis
The Radiant Wrasse is a striking Western Indian Ocean species. A superb hunter of crustacean pests, it requires a secure lid, a fine sand bed for sleeping, and a balanced diet of meaty foods.
Water Temperature
22 - 26 °C
pH Value
8.1 - 8.4
Water type
Marine
Tank level
All levels
Adult size
12 cm
Minimum tank volume
>= 200 L
Minimum group
>= 1
GH
15 - 25 dGH
KH
8 - 12 dKH
Species description
Geographical Origin and Habitat: Native to the Western Indian Ocean, along the East African coast from South Africa and Madagascar to the Seychelles, Mascarene, and Chagos islands. Inhabits seaward reefs and steep drop-offs rich in soft corals at depths of 6 to 43 meters.
Taxonomy and Morphology: Member of the family Labridae, genus Halichoeres. Features an elongated body and slightly compressed head. Adults reach a maximum size of 12 cm. Possesses a small mouth with prominent canine teeth.
Social Behavior: Diurnal, active, and extremely inquisitive. Spends daylight hours exploring rocks and sand for pests. Solitary or lives in small harems led by a dominant male. Burrows to sleep.
Coloration and Sexual Dimorphism: Beautiful color contrast: deep brick-red or dark orange body and a bright canary-yellow or orange head, separated by a dark stripe. Dominant males display more saturated green and pink facial markings than females and juveniles.
Care, breeding and tankmates
Aquarium Setup: Requires an aquarium of at least 200 liters with a deep, fine sand bed (at least 5 cm) for sleeping and retreat. Live rock is essential for foraging. The tank must be tightly covered to prevent jumping.
Diet and Feeding: Carnivorous. Feeds on small crustaceans and pests. Highly useful for controlling flatworms and parasitic snails. Feed 2-3 times daily with mysis, brine shrimp, chopped krill, and high-quality pellet food.
Water Quality: Stable parameters: temperature 22-26°C, pH 8.1-8.4, specific gravity (SG) 1.020-1.025, GH 15-25, KH 8-12. Appreciates moderate to strong water movement and excellent filtration.
Compatibility and Cohabitation: Reef safe with caution. Ideal for coral community aquariums. Harmless to corals. May prey on tiny ornamental shrimp and small snails. Do not house with highly aggressive wrasses.
Aquarium Breeding: Protogynous hermaphrodite. Captive breeding is undocumented due to the extreme difficulty of raising pelagic larvae in open water.
Risks and Diseases: High jumping risk when startled. Snout injuries and stress can occur if the sand bed is too coarse or sharp. Susceptible to external parasites under stress.
Geographic Origin and Distribution
Native to the Western Indian Ocean, along the East African coast from South Africa and Madagascar to the Seychelles, Mascarene, and Chagos islands. Inhabits seaward reefs and steep drop-offs rich in soft corals at depths of 6 to 43 meters.
Origin
Tropical oceans and reefsAfrica and MadagascarSouth and Southeast Asia
Fish profile
- Temperament
- Territorial
- The Radiant Wrasse has a peaceful and inquisitive temperament. It spends its time hunting without bothering most tank mates. However, it may bully smaller, more timid fish if introduced improperly.
- Diet
- Carnivore
- In the wild, it is a benthic predator feeding on small invertebrates. Its captive diet should include mysis shrimp, brine shrimp, and high-quality marine pellets. It effectively controls pests like flatworms and pyramidellid snails.
- Life expectancy
- 4-8 years
- In captivity, the Radiant Wrasse can live between 4 and 8 years when kept in a healthy, mature aquarium. To achieve this, they must have a fine sand bed of at least 6-8 centimeters, which is vital for their natural behavior of burying themselves to sleep and hide. A tight lid is mandatory, as this active species is prone to jumping when startled by lighting shifts or tankmates. Maintaining steady water quality and low nutrient levels will significantly prevent disease and support their longevity.
- Adult size
- 12 cm
- The catalog's scalar value is 12 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 11.5 cm for this species, recorded as total length (TL). The taxonomic record consulted is Halichoeres iridis (v25.04); male or unsexed record. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
- Sex ratio
- Harem
- They are protogynous hermaphrodites, meaning females can transition to males. It is best to keep them singly or as one male with multiple females. Multiple males in the same tank will fight to the death.
- Feeding frequency
- 2-3 times daily
- Due to its high metabolism, it needs multiple small meals daily. Feeding two to three times a day is highly recommended. Consistent feeding keeps the fish vigorous and healthy.
- Bioload
- Medium
- This wrasse produces a moderate bioload due to its active nature. It requires frequent feedings which contribute to waste buildup. Adequate protein skimming and regular water changes are necessary.
- Flow
- Strong
- It thrives in moderate to strong water flow environments. Strong currents simulate its natural reef habitat and keep it active. Good flow also aids in keeping detritus suspended for filtration.
- Jump risk
- Yes
- This species is an extremely notorious jumper when startled. Its streamlined body allows it to easily leap from open tanks. A tight-fitting lid or mesh screen is absolutely mandatory.
- Reproduction
- Oviparous
- Breeding this species in home aquariums is exceedingly difficult. They are pelagic spawners that release eggs into the water column. The planktonic larvae require highly specialized microscopic foods to survive.
- Compatibility & tankmates
- With caution
- It is generally peaceful and considered reef-safe for community marine tanks. While safe with corals, it may eat small ornamental crustaceans. Avoid keeping it with other male wrasses to prevent territorial aggression.
- Tank level
- All levels
- It actively swims in the middle and bottom levels during the day. It constantly searches the rockwork for small prey. At night, it requires a deep sand bed to bury itself and sleep.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Trophic level
- 3.4 ± 0.5 se
- Resilience
- High (less than 15 months)
- Phylogenetic uniqueness (PD50)
- 0.5
- Bayesian Length-Weight
- a = 0.01, b = 3.09
- VulnerabilityLow vulnerability (10 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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