Blueside Fairy Wrasse - Male
Blueside Fairy Wrasse - Male
Goes well with:
FAQs Answers to the most common questions.
Can a Bluesided Fairy Wrasse change from female to male in a home aquarium, and what signs show it is transitioning?
Yes. Bluesided Fairy Wrasses are protogynous hermaphrodites, meaning females can become males, especially if there is no dominant male present. Signs include: increased body size and more elongated fins; intensifying coloration with stronger blue along the flanks and more vivid reds/oranges; more active swimming in the water column and patrolling behavior; and increased display toward other wrasses, including flaring fins and short, rapid dashes. The full transition can take several weeks to a few months, depending on diet, stress level, and tank hierarchy.
Why does my Bluesided Fairy Wrasse lose its bright colors in the evening, almost turning pale or mottled?
Bluesided Fairy Wrasses have a distinct “sleep” pattern, often dulling their colors dramatically at night. This is normal and serves as camouflage while they rest. As lights dim, hormones shift and the fish switches to its night pattern: colors fade, patterns become blotchy, and the fish may tuck into rock crevices or rest on the sand if no secure cave is available. Once lights come back on and the fish fully wakes up (usually within 15–30 minutes), normal daytime coloration returns.
My Bluesided Fairy Wrasse constantly paces the glass and jumps at the lid—what specific environmental factors cause this in this species?
Bluesided Fairy Wrasses are very active, mid‑water swimmers that react strongly to confinement stress and sudden movement. Common causes include: tanks under ~75–90 cm (30–36 in) long; too little open swimming space due to heavy rock stacking; bright room light or sudden shadows outside the tank; strong reflections in the glass causing the fish to “fight” its own image; and high-flow outlets pointed directly across its normal swimming path. Solutions: use a tight-fitting, fine mesh lid; provide at least a 3-foot tank length with open central swimming space; break up reflections with background film or plants; angle powerheads so flow is strong but diffuse; and maintain a stable, calm room environment.
What is the best feeding strategy for a Bluesided Fairy Wrasse that ignores pellets but eagerly eats frozen and live foods?
This species often prefers movement and scent. Start with finely chopped frozen foods (mysis, brine, chopped krill, calanus, fish roe) and small live items (copepods, enriched baby brine). Then: mix a few high-quality small pellets (e.g., 0.5–1 mm) into thawed frozen food so they take on the scent; gradually increase the pellet ratio over days to weeks; feed small amounts 2–3 times daily to match their grazing nature; and occasionally release food into the flow so it drifts and triggers hunting behavior. Many Bluesided Fairy Wrasses eventually accept pellets once they associate their smell and shape with normal feeding.
How does keeping multiple Bluesided Fairy Wrasses or mixing them with other fairy wrasse species affect aggression and coloration?
With enough space (typically a 4-foot tank or larger), a small harem—one male Bluesided Fairy Wrasse with 2–3 females—usually produces the best behavior and color intensity in the male. He will display more often, showing stronger blues and reds. However, housing more than one male Bluesided Fairy Wrasse in a modest tank often leads to persistent chasing and stress. When mixing with other Cirrhilabrus species, avoid combining with very similar-looking males (similar body shape and color patterns) in smaller systems, as they see each other as rivals. Instead, pair one Bluesided male with females of his own species and, if desired, other fairy wrasses that have distinctly different body patterns and which are known to be relatively peaceful, adding the Bluesided male later or with an acclimation box to manage territorial disputes.
All listed sizes are approximate, not guaranteed, and may vary slightly.
The male Blueside Fairy Wrasse, Cirrhilabrus cyanopleura, is a brilliantly colored saltwater fish prized for its vivid contrast and graceful, constant movement in the water column. Mature males display an eye-catching blend of pink, red, yellow, and violet tones, highlighted by the species’ characteristic blue coloration along the sides. Under reef aquarium lighting, those colors become even more striking, especially when the fish is actively displaying.
Native to the Indo-West Pacific, this species inhabits reef slopes, lagoon edges, and coral-rich areas where it feeds on zooplankton above the reef. In the aquarium, the male Blueside Fairy Wrasse brings both color and activity to a peaceful marine community. Its manageable adult size, reef-safe nature, and elegant display behavior make it a highly desirable choice for established reef aquariums and peaceful fish-only aquariums.
Quick Care Guide
Care Level: Easy to Moderate
Minimum Tank Size: 75 gallons
Temperament: Peaceful
Diet: Carnivore / Planktivore
Reef Safe: Yes
Region: Indo-West Pacific
Scientific Name: Cirrhilabrus cyanopleura
Tank Requirements
The Blueside Fairy Wrasse should be housed in an established marine aquarium with a combination of open swimming space and secure rockwork. A 75-gallon or larger aquarium provides suitable long-term room for its adult size and active swimming behavior.
Arrange live rock to create caves, overhangs, and narrow crevices where the fish can retreat when startled and rest at night. Unlike sand-burying wrasses, this species typically seeks shelter within rockwork rather than the substrate, so a deep sand bed is not required.
Moderate water movement, strong oxygenation, efficient filtration, and stable water quality are ideal. A tightly fitted mesh or solid lid is essential, as fairy wrasses are excellent jumpers and can escape through very small openings.
Diet and Feeding
The Blueside Fairy Wrasse is primarily a planktivore and naturally feeds on small crustaceans and zooplankton suspended in the water column.
Offer a varied diet of mysis shrimp, enriched brine shrimp, copepods, finely chopped marine seafood, quality frozen plankton blends, and appropriately sized marine pellets. Foods that remain suspended in the water help encourage natural feeding behavior.
Two to three smaller feedings per day are ideal when possible. A mature aquarium with naturally occurring copepods and other microfauna can provide additional feeding opportunities between prepared meals.
Temperament and Tankmates
The male Blueside Fairy Wrasse is generally peaceful and mixes well with a wide range of non-aggressive marine fish. Suitable tankmates include clownfish, gobies, blennies, cardinalfish, anthias, peaceful tangs, and other community-oriented species.
Males may display toward other fairy wrasses, particularly similarly colored or shaped species. In sufficiently spacious aquariums, multiple fairy wrasses can be maintained successfully with careful species selection and introduction order.
Avoid housing this fish with aggressive tankmates that may intimidate it, outcompete it for food, or prevent it from swimming openly.
Reef Compatibility
The Blueside Fairy Wrasse is considered reef safe and is an excellent choice for coral-dominated reef aquariums. It does not normally nip or damage healthy corals.
It is also generally compatible with ornamental shrimp, crabs, snails, clams, and other common reef invertebrates. Like many planktivorous wrasses, it may consume tiny naturally occurring copepods and other microcrustaceans as part of its normal diet.
Water Parameters
Temperature: 75–80°F
Specific Gravity: 1.024–1.026
pH: 8.1–8.4
Alkalinity: 8–12 dKH
Stable conditions are more important than chasing exact numbers. Maintain consistent salinity and temperature along with good oxygenation, dependable filtration, and regular aquarium maintenance.
Common Considerations
-
Exceptional jumping risk: A tightly fitted lid or mesh cover is essential, including around plumbing and equipment openings.
-
Male coloration is more intense: Mature males display the strongest blue, pink, red, and yellow tones, especially when displaying.
-
No deep sand bed required: This species normally shelters within rockwork rather than burying in the substrate.
-
Frequent feeding preferred: Multiple smaller meals of planktonic and protein-rich foods help maintain healthy body condition.
-
Peaceful but active: Best kept with other non-aggressive species that will not bully or outcompete it.
