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Ruby Fairy Wrasse

Cirrhilabrus rubeus

Ruby Fairy Wrasse (Cirrhilabrus rubeus): marine reef fish of the family Labridae, prized for its unique husbandry requirements.

Family
Labridae
Origin
Indo-West Pacific: Maldives and Sri Lanka.
Origin
Tropical oceans and reefsExtra-Amazon South AmericaSouth and Southeast Asia
Tank use
Used in 0 tanks

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Species challenges
Water Temperature

22 °C - 27 °C

pH Value

8.1 - 8.4

Water type

Marine

Tank level

Mid-water

Adult size

8 cm

Species description

Geographic Origin and Biotope: Tropical Indo-Pacific. Inhabits deep rocky walls and outer sandy slopes rich in sponges off the Maldives and Sri Lanka between 25 and 50 meters.

Taxonomy and Morphology: Belongs to the family Labridae. Reaches about 8 cm. Elongated body, large eyes ringed with yellow, and broad fins.

Social Behavior: Peaceful swimming fish. Lives in mid-water forming small groups. Does not sleep in the sand but produces a protective mucus cocoon under ledges.

Coloration and Sexual Dimorphism: Stunning coloration: deep ruby-red body on the back, fading to bright orange and yellow on the flanks. Males present elongated pelvic fins and showy courtship displays.

Care, breeding and tankmates

Aquarium Setup: Requires a tank of at least 150 liters (40 gallons) rich in rocks arranged in a barrier with many hiding places and open swimming lanes.

Diet and Feeding: Carnivore. Feed with small frozen foods such as mysis, brine shrimp, Cyclops, and copepods. Easily accepts small-sized pellets.

Water Quality: Temperature 22-27°C (72-80°F), pH 8.1-8.4, specific gravity 1.020-1.025. Good skimming keeps the water clear and oxygenated.

Compatibility and Tankmates: 100% reef-safe. Does not touch hard or soft corals, or beneficial invertebrates. Can fight with males of the same or similar species.

Aquarium Reproduction: Reproduction is not successfully documented in home aquariums. In the wild, they release pelagic eggs that rise to the surface.

Risks and Diseases: Excellent jumper. Cover the aquarium perfectly with a fine mesh screen or a protective lid to prevent losses.

Fish profile

Temperament
Peaceful
Diet
Carnivore
Tank level
Mid-water
Minimum group
1
Adult size
8 cm
Minimum tank volume
150 L
GH
n/a
KH
8 dKH - 12 dKH
TDS
n/a
Conductivity
n/a
Sex ratio
Solitary or in harem (one male, multiple females).
Feeding frequency
Feed twice daily.
Bioload
Low
Flow
Medium
Jump risk
Covered tank required
Reproduction
Protogynous hermaphrodites. Spawning in captivity is not successfully documented.
Compatibility & tankmates
Peaceful. Safe with corals and other peaceful fish. Can fight with other male fairy wrasses.

Ecological Estimates & Biological Models

Trophic level
3.3 ± 0.4 se
Resilience
High (less than 15 months)
Phylogenetic uniqueness (PD50)
0.5
Bayesian Length-Weight
a = 0.01072, b = 3.03
VulnerabilityLow vulnerability (10 / 100)

Image gallery

Licensed images linked to the species or, when marked, to the closest representative taxon.

Related species

Other recommended species with similar care requirements and water parameters.

Last updated: 06/12/2026