White Bar Mystery Wrasse - Pseudocheilinus ocellatus cf.

Q: How can I tell a true White Bar Mystery Wrasse from other “mystery wrasse” lookalikes, and what adult size should I expect?

A true White Bar Mystery Wrasse is typically the Hawaiian/Indo-Pacific mystery wrasse, Pseudocheilinus ocellatus, with a bold white or pale vertical bar pattern on the body and the classic wrasse shape of an elongated, slim fish with a pointed face. Juveniles and females often show more contrasting bars and spots, while adults can become more richly colored and darker. Expect about 4 to 5 inches as an adult, with males usually looking more intense in color and pattern.

Q: Is a White Bar Mystery Wrasse truly reef safe, especially with shrimp, small crabs, and snails?

It is generally reef safe with corals, but not fully “invert safe.” This wrasse is known to prey on very small crustaceans and may eat ornamental shrimp, tiny crabs, bristleworms, snails, and other small invertebrates if given the chance. In a reef tank, it is best kept with larger, more established cleanup crew members and not trusted with very small shrimp like sexy shrimp or delicate micro-crustaceans.

Q: Can I keep a White Bar Mystery Wrasse with other wrasses, and what tankmates are most likely to cause problems?

This species can be quite aggressive toward other wrasses, especially similar-shaped or similarly colored species like fairy wrasses, flasher wrasses, and other Pseudocheilinus wrasses. It often does best as the only wrasse in a tank unless the system is large and carefully structured with plenty of hiding places. Peaceful fish that won’t compete for the same sleeping spots or food, such as tangs, gobies, blennies, and many peaceful angels, are usually better tankmates.

Q: What tank size and aquascape does a White Bar Mystery Wrasse need to stay healthy and reduce aggression?

A 50-gallon tank is a practical minimum for a single specimen, but larger is better, especially if you want to reduce territorial behavior. The tank should have a mature rockwork structure with lots of crevices, overhangs, and caves because this wrasse likes to dart in and out of tight spaces. A secure lid is essential, since White Bar Mystery Wrasses are notorious jumpers, especially when startled or when establishing territory.

Q: What should I feed a White Bar Mystery Wrasse to keep its color strong and prevent it from becoming overly aggressive?

Feed a varied meaty diet: frozen mysis, enriched brine shrimp, chopped seafood, finely cut krill, and quality marine pellets or granules. They do best with small meals once or twice daily rather than one large feeding. A well-fed White Bar Mystery Wrasse tends to show better coloration, settle more easily, and may be less likely to harass tankmates, although it can still be naturally territorial.

White Bar Mystery Wrasse - Pseudocheilinus cf. ocellatus

Tiny (<1")

$199.99

White Bar Mystery Wrasse - Pseudocheilinus cf. ocellatus

Reef Safe Caution Wrasses

$199.99

Size Tiny (<1") Small (1.1-1.25") SM (1.26-1.5") Medium (1.51-1.75") ML (1.76-2") Large (2.1-2.25") XL (2.26-5") XX (2.51-2.75") SHOW (2.76-3.25")

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Goes well with:

Diet

mysis shrimp brine shrimp high-quality marine flakes/pellets

Min Tank Size 55 gallons

Temperament Semi-aggressive

Reef Safe With Caution

Care & Diet Feeding, nutrition, and best practices.

Diet Type: Carnivore

Diet and Feeding: White Bar Mystery Wrasse are carnivorous micro-predators that naturally hunt small crustaceans, zooplankton, worms, and other tiny invertebrates among reef rubble and coral structures. In captivity, it is beneficial to make the bulk of the diet high-quality marine-based frozen and prepared foods such as mysis shrimp, enriched brine shrimp, finely chopped krill, and small carnivore pellets or flakes formulated with seafood and marine proteins; frequent variety is ideal. To ensure balanced nutrition, offer supplemental treats such as copepods, amphipods, chopped clam, and occasional vitamin- or HUFA-enriched foods. Feeding with small portions several times daily is recommended, and using a feeding ring or target feeding in the water column can encourage natural foraging behavior and reduce waste. Avoid overfeeding, as wrasses are active eaters and excess food can quickly compromise water quality.

mysis shrimp brine shrimp high-quality marine flakes/pellets

Behavior Temperament, activity level, and interactions.

Temperament: Semi-aggressive

The White Bar Mystery Wrasse is an active, midwater-to-rockwork swimmer that benefits from a tank with ample open space for cruising as well as plenty of caves and crevices for retreat. It is generally semi-aggressive and can become territorial, especially toward conspecifics and similarly shaped wrasses, so multiple individuals should only be attempted in very large systems with strong visual barriers. A minimum tank size of 55 gallons is recommended, with a well-structured aquascape that breaks sightlines and provides secure hiding places to reduce stress and limit chasing. In mixed community reef setups, it is usually compatible with other reef-safe species, though small, timid tank mates may be outcompeted or harassed if space is limited. This wrasse is carnivorous to omnivorous in practice, feeding primarily on small crustaceans, worms, and other meaty invertebrates it picks from the rocks and water column. Regular offerings of frozen and prepared marine foods, along with frequent feedings, help maintain its health and keep it from preying excessively on desirable microfauna.

Tank & Aquascape Tank requirements and aquascaping tips.

Min Tank Size: 55 gallons
Max Size: 6 inches
Care Level: Moderate
Origin: Indo-Pacific

Compatibility Tank mates, aggression, and introduction order.

Temperament: Semi-aggressive
Reef Safe: With Caution

Reef & Health Reef safety, common issues, and prevention.

Reef Safe: With Caution
Care Level: Moderate

FAQs Answers to the most common questions.

How can I tell a true White Bar Mystery Wrasse from other “mystery wrasse” lookalikes, and what adult size should I expect?

A true White Bar Mystery Wrasse is typically the Hawaiian/Indo-Pacific mystery wrasse, Pseudocheilinus ocellatus, with a bold white or pale vertical bar pattern on the body and the classic wrasse shape of an elongated, slim fish with a pointed face. Juveniles and females often show more contrasting bars and spots, while adults can become more richly colored and darker. Expect about 4 to 5 inches as an adult, with males usually looking more intense in color and pattern.

Is a White Bar Mystery Wrasse truly reef safe, especially with shrimp, small crabs, and snails?

It is generally reef safe with corals, but not fully “invert safe.” This wrasse is known to prey on very small crustaceans and may eat ornamental shrimp, tiny crabs, bristleworms, snails, and other small invertebrates if given the chance. In a reef tank, it is best kept with larger, more established cleanup crew members and not trusted with very small shrimp like sexy shrimp or delicate micro-crustaceans.

Can I keep a White Bar Mystery Wrasse with other wrasses, and what tankmates are most likely to cause problems?

This species can be quite aggressive toward other wrasses, especially similar-shaped or similarly colored species like fairy wrasses, flasher wrasses, and other Pseudocheilinus wrasses. It often does best as the only wrasse in a tank unless the system is large and carefully structured with plenty of hiding places. Peaceful fish that won’t compete for the same sleeping spots or food, such as tangs, gobies, blennies, and many peaceful angels, are usually better tankmates.

What tank size and aquascape does a White Bar Mystery Wrasse need to stay healthy and reduce aggression?

A 50-gallon tank is a practical minimum for a single specimen, but larger is better, especially if you want to reduce territorial behavior. The tank should have a mature rockwork structure with lots of crevices, overhangs, and caves because this wrasse likes to dart in and out of tight spaces. A secure lid is essential, since White Bar Mystery Wrasses are notorious jumpers, especially when startled or when establishing territory.

What should I feed a White Bar Mystery Wrasse to keep its color strong and prevent it from becoming overly aggressive?

Feed a varied meaty diet: frozen mysis, enriched brine shrimp, chopped seafood, finely cut krill, and quality marine pellets or granules. They do best with small meals once or twice daily rather than one large feeding. A well-fed White Bar Mystery Wrasse tends to show better coloration, settle more easily, and may be less likely to harass tankmates, although it can still be naturally territorial.

The White Bar Mystery Wrasse is a striking and highly distinctive reef fish sold under the designation Pseudocheilinus cf. ocellatus. Its deep red to burgundy body is accented by contrasting pale vertical bars, intricate facial markings, and a prominent eyespot near the rear of the body. Color intensity can vary considerably between individuals, giving this unusual Mystery Wrasse an especially dramatic appearance under reef aquarium lighting.

The “cf.” designation indicates that this form closely resembles Pseudocheilinus ocellatus but is not being presented here as a definitively identified population of that species. True P. ocellatus is a western and central Pacific reef-associated wrasse found primarily in deeper coral reef habitats, with records from approximately 20–100 meters and a maximum reported standard length of about 10.3 cm.

Active yet secretive, this marine aquarium fish spends much of its time weaving through rockwork, caves, and coral structure in search of small prey. Its compact adult size, bold coloration, and engaging behavior make it particularly attractive for established reef aquariums, although its territorial personality and interest in small invertebrates require thoughtful tankmate selection.

Quick Care Guide

Care Level: Moderate
Minimum Tank Size: 55 gallons
Temperament: Semi-aggressive
Diet: Carnivore
Reef Safe: With Caution
Region: Western and Central Pacific; exact provenance may vary for specimens sold as P. cf. ocellatus
Scientific Name: Pseudocheilinus cf. ocellatus

A 55-gallon aquarium provides a practical adult-size minimum for this active, territorial wrasse; aquarium references for P. ocellatus similarly recommend approximately 53–55 gallons or larger.

Tank Requirements

Provide a mature saltwater aquarium with substantial live rock arranged to create caves, shaded overhangs, narrow crevices, and multiple escape routes. Pseudocheilinus ocellatus is naturally associated with coral reefs and is described as a cryptic species that favors darker reef areas, making complex rockwork especially important for helping newly introduced specimens feel secure.

Leave some open swimming room around the rock structure, but prioritize a complex environment where the fish can move in and out of cover. Unlike sand-burying wrasses, Mystery Wrasses rely primarily on reef structure for shelter, so a specialized deep sand bed is not necessary.

A secure, tightly fitting lid is strongly recommended. Wrasses are capable jumpers, particularly when newly introduced, startled, or chased by established tankmates. Aquarium husbandry references specifically note jumping risk for P. ocellatus.

Moderate to strong reef-style circulation is appropriate, provided sheltered areas remain available within the rockwork.

Diet and Feeding

The White Bar Mystery Wrasse is a carnivorous micro-predator that should receive a varied diet of small, protein-rich marine foods. In the aquarium, suitable offerings include:

Frozen mysis shrimp
Enriched brine shrimp
Copepods and other zooplankton
Finely chopped shrimp or marine seafood
Quality carnivore pellets
Frozen marine blends containing small crustaceans

Small crustaceans and zooplankton are particularly appropriate foods for Pseudocheilinus wrasses, which naturally forage through reef structure for small mobile prey.

Feed once or twice daily, offering appropriately sized portions. Newly acclimated individuals may initially remain close to rockwork, so placing food near their preferred shelter can encourage feeding until they become more confident.

Temperament and Tankmates

The White Bar Mystery Wrasse should be considered semi-aggressive. While it can coexist successfully with many established reef fish, mature individuals may become territorial, particularly toward other wrasses or fish with similar body shapes and feeding habits. Aquarium references for P. ocellatus likewise note that the species can show aggression toward other fish.

Keeping a single specimen is the safest choice for most home aquariums. Mixing it with Six Line Wrasses, Four Line Wrasses, Eight Line Wrasses, other Mystery Wrasses, or similar Pseudocheilinus species can result in persistent territorial disputes unless the aquarium is exceptionally large and carefully structured.

Good tankmates include appropriately sized clownfish, dwarf angelfish, tangs, rabbitfish, larger gobies, basslets, and other confident reef fish. Very small, timid, or newly introduced fish should be monitored carefully, particularly once the wrasse has established a territory.

Reef Compatibility

The White Bar Mystery Wrasse is best classified as reef safe with caution.

It is not normally considered a coral-eating fish, making it suitable for many mixed reef aquariums. However, its natural predatory behavior toward small crustaceans means tiny ornamental shrimp and other very small mobile invertebrates may be at risk. Aquarium references classify P. ocellatus as coral-compatible while also noting potential predation on small animals.

Larger established ornamental shrimp are generally less vulnerable than very small shrimp, but they cannot be guaranteed safe. Small crabs, tiny snails, worms, amphipods, copepods, and other microfauna may also be hunted as part of the wrasse's normal foraging behavior.

Corals and clams are generally not the primary concern with this species; small mobile invertebrates are the greater compatibility consideration.

Water Parameters

Temperature: 75–80°F
Specific Gravity: 1.024–1.026
pH: 8.1–8.4
Alkalinity: 8–12 dKH

Consistent salinity, temperature, and overall water quality are more important than continually adjusting the aquarium to reach one exact number within these ranges.

Common Considerations

Taxonomic designation: The “cf.” in Pseudocheilinus cf. ocellatus means the fish resembles P. ocellatus but should not be represented as a definitively identified form without further taxonomic confirmation.
Adult size: True P. ocellatus reaches approximately 10.3 cm standard length, making it a relatively compact but active and territorial wrasse.
Secure lid required: This species can jump, especially during acclimation or territorial encounters.
Provide extensive rockwork: Caves, crevices, and shaded areas help replicate the secretive reef habitat associated with P. ocellatus.
Watch small invertebrates: Although generally compatible with corals, small ornamental crustaceans and reef microfauna may be hunted.