Scarlet Pin Stripe Wrasse

The Scarlet Pin Stripe Wrasse (Pseudocheilinus evanidus) is recognized by a slender reddish body with very fine pale horizontal lines. Its movements and daily feeding behavior are as characteristic as its coloration: it searches its surroundings for food while remaining aware of nearby shelter. Coloration varies with maturity, social status, and lighting, and an individual at rest may look less intense than a displaying adult.

Native to Indo-Pacific, this wrasse is associated with coral and rock crevices where it can inspect sheltered surfaces for tiny animal prey. Scarlet Pin Stripe spends much of its time close to rock and needs crevices, not a mandatory burial sand bed. These natural habits are useful guides when planning the aquarium, especially the arrangement of shelter, feeding locations, and suitable companions.

Plan adult housing for a fish reaching approximately 3.5 inches (9 cm) in a system of at least 55 gallons. An established marine aquarium with suitable space and compatible residents supports its natural activity. Swimming footprint, food access, and adult behavior matter alongside water volume.

Quick Care Guide

Care Level: Moderate
Minimum Tank Size: 55 Gallons
Adult Size: Approximately 3.5 inches (9 cm)
Temperament: Semi-Aggressive
Diet: Carnivore
Reef Safe: With Caution
Region: Indo-Pacific
Scientific Name: Pseudocheilinus evanidus

Tank Requirements

Use a fully cycled, established marine aquarium of at least 55 gallons for long-term adult housing. Provide room to explore between feeding and resting areas without repeatedly crossing another fish's defended territory. A tall, narrow aquarium is not equivalent to a broad display simply because its volume is similar.

Provide secure rock crevices for resting. This wrasse does not require a deep sand bed for sleeping in the way that leopard or tamarin wrasses do. Sand can be included, but it does not replace appropriately sized caves and sheltered gaps in the rockwork.

Arrange stable caves and protected resting spaces. Leave several approaches to each main structure so a dominant fish cannot easily trap the wrasse inside a single-entry shelter.

Build a stable aquascape with enough separation between structures to create visual breaks. Keep gaps wide enough that the adult cannot become wedged while escaping a tankmate. Leave room to clean waste from behind and below the main structures.

A tightly fitted lid is essential. Wrasses can jump during feeding, social displays, introductions, or sudden changes in lighting. Cover cable openings, overflow gaps, and small spaces around plumbing; a lid that fits the main opening but leaves escape gaps is incomplete protection.

Provide good circulation, surface agitation, and dependable oxygenation, with sheltered areas where the fish can rest away from direct pump output. Efficient biological filtration and routine mechanical waste removal are important with frequent feeding.

Maintain mature rock surfaces and good water quality before adding the fish. Established shelter and a predictable maintenance routine help the fish settle without repeated disruption of its environment.

The minimum volume applies to an appropriately stocked display, not an unlimited collection of wrasses. Additional similarly shaped or highly active fish require more space than a single-specimen recommendation. Keep an isolation option available if the social arrangement changes.

Diet and Feeding

The Scarlet Pin Stripe Wrasse is a carnivorous hunter of small marine animal prey. A captive diet should match the size and texture of foods it can actually swallow, rather than relying on a single convenient frozen item.

A varied feeding rotation is preferable to one repeated ingredient. Pellets can be useful when accepted, while suitable frozen and marine seafood items broaden texture and nutritional variety.

Offer a balanced selection that includes:

• Frozen mysis shrimp

• Enriched brine shrimp

• Appropriately sized marine crustaceans

• Finely chopped clam, mussel, and other marine seafood

• Balanced frozen marine carnivore blends

• Suitable marine pellets when accepted

Provide two to three small meals daily, adjusting amount and frequency to activity, age, and actual consumption. Growing juveniles and thin new arrivals may need extra small opportunities rather than one oversized meal.

Distribute food at more than one location, including areas near shelter. This helps reduce crowding and makes it easier to see whether the wrasse is receiving its share.

Watch for swallowing rather than food being mouthed and discarded. A wrasse that approaches food eagerly but rejects every item may still be underfed.

Avoid relying exclusively on unenriched brine shrimp or a single frozen food. Marine-based foods are appropriate; freshwater feeder fish and terrestrial meat are unnecessary. Remove uneaten portions before they collect inside caves or beneath rockwork.

Check the abdomen and overall body condition regularly. Persistent pinching, reduced activity, repeated food rejection, or a fish disappearing whenever feeding begins calls for closer assessment of water quality, competition, and the feeding arrangement.

Pest-hunting behavior is useful to observe, but it does not make the fish a guaranteed solution for every nuisance organism. Prepared-food support remains necessary even in a mature aquarium.

Temperament and Tankmates

The Scarlet Pin Stripe Wrasse is best described as semi-aggressive. Natural hunting behavior and territorial interactions should guide tankmate selection rather than an assumption that all wrasses behave alike.

A single individual is the most predictable arrangement in a typical home display. Related wrasses and similar-looking competitors require more space and a deliberate introduction plan.

Choose appropriately sized companions that use different feeding and resting areas, while avoiding fish small enough to be taken as prey.

Lined wrasses can be particularly troublesome for shy fairy wrasses, flashers, possums, and newly introduced small fish. Do not equate their manageable size with gentle behavior.

Use a covered acclimation box when it is suitable for evaluating reactions, with good water exchange and shelter. Observe both the newcomer and established residents. Behavior through a barrier is useful information, but it does not guarantee permanent compatibility after release.

Watch interactions around feeding areas and nighttime shelters. Repeated chasing, exclusion from food, damaged fins, or a fish trapped in one corner indicates that changes are needed. Do not wait for severe injury before separating incompatible residents.

Temperament can change with maturity or a new social arrangement. Reassess compatibility after growth, new additions, or significant changes to the aquascape.

A complex layout and additional space can reduce encounters, but they do not make an unsuitable combination dependable. Keep a practical removal or isolation plan available before introducing another closely related or similarly patterned fish.

Reef Compatibility

The Scarlet Pin Stripe Wrasse is reef safe with caution. Coral tissue may be ignored while small ornamental invertebrates are still hunted.

Potential prey includes small shrimp, worms, tiny crustaceans, and other vulnerable invertebrates. The risk reflects its natural hunting ecology rather than simply whether it has been fed recently.

A fish that initially ignores an animal may behave differently after growth or a molt. Adult mouth size, individual feeding habits, and the vulnerability of the invertebrate are all relevant.

Regular varied feeding supports health but cannot guarantee that ornamental animals will be ignored. Do not use a full stomach as the sole basis for combining a hunting wrasse with valuable shrimp or cleanup-crew animals.

Protect loose coral fragments and maintain secure placement, especially where the fish searches the substrate or moves quickly between rock structures.

A deliberately selected reef placement requires acceptance of these risks and a practical removal plan. Coral compatibility alone does not establish compatibility with every animal sold as reef livestock.

Observe the actual individual rather than relying on a general reputation for pest control or utility. Beneficial small animals may be consumed along with nuisance prey.

Water Parameters

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

Maintain undetectable ammonia and nitrite with stable temperature, salinity, and good oxygenation. Frequent feeding increases nutrient input, so filtration and maintenance should match actual consumption and waste rather than a lightly stocked aquarium's previous routine.

Avoid sudden changes in temperature, salinity, or pH. Use calibrated instruments, consistent top-off, and a predictable maintenance schedule. Steady conditions within an appropriate range are preferable to repeated adjustments made solely to chase an exact number.

Clean trapped food and detritus from sheltered areas without repeatedly dismantling the fish's only resting site. Maintain surface movement and restore normal circulation promptly after feeding adjustments.

Quarantine in a fully supported system that reflects this fish's shelter and feeding needs. Provide suitable inert shelters and a covered aquarium. A bare, unstable holding tank can create stress or ammonia problems; medications and treatment decisions should be species-appropriate.

Common Considerations

• Adult Housing: Plan for approximately 3.5 inches (9 cm) and at least 55 gallons, with a suitable adult footprint and additional space for competing residents.

• Secure Cover: Close every practical escape route around the lid, plumbing, and overflow. Jumping can occur after long periods of otherwise settled behavior.

• Protected Shelter: Provide stable, appropriately sized rock crevices and shaded retreats; suitable shelter cannot be replaced by open water alone.

• Feeding and Body Condition: Use a varied marine menu, observe swallowing, and make sure dominant residents do not prevent regular food intake.

• Species and Compatibility: Scarlet Pin Stripe spends much of its time close to rock and needs crevices, not a mandatory burial sand bed.