Six-Line Wrasse

This page is educational reference material for preparing questions. A licensed veterinarian examines the animal, makes the diagnosis, and sets the treatment.

Six-Line Wrasse Overview

The Six-Line Wrasse is a small (3 in) saltwater species originating from the Indo-Pacific. Known for being semi-aggressive, active, this species is rated beginner care level, making it an excellent choice for aquarists new to saltwater keeping. With a lifespan of 4-6 years, this is a rewarding species that can be enjoyed for many years with proper care.

Natural pest controller eating flatworms, pyramidellid snails, and bristleworms; six distinctive horizontal lines; can become territorial in smaller tanks

Six-Line Wrasse three disciplines determine outcomes: keeping parameters stable, measuring feed portions, and quarantining new livestock thoroughly; these factors drive outcomes more than brand-name products.

Pseudocheilinus hexataenia is a small Indo-Pacific wrasse, about 3 inches, with a lifespan of 4 to 6 years. Thirty gallons is as small as this territorial wrasse should go. The card rates them beginner, which underplays how they treat a small tank. The diet is carnivore: mysis, brine shrimp, pellets, and a useful habit of hunting flatworms. They are active all day and semi-aggressive about the whole footprint. A six-line eats flatworms and other pests, and it also eats ornamental shrimp. In a small tank the territorial side is the one you will see every day.

From a water chemistry perspective, maintaining a saltwater aquarium for Six-Line Wrasse demands consistent attention to parameters including temperature (72-78°F), pH (8.1-8.4), and tank capacity (minimum 30 gallons). These parameters are not merely guidelines—they represent the range within which Six-Line Wrasse's metabolic processes, immune function, and reproductive behaviors operate optimally. Successful Six-Line Wrasse keeping therefore requires not just the right equipment, but a disciplined approach to monitoring and maintaining water quality over the long term.

Temperament & Compatibility

The Six-Line Wrasse is described as semi-aggressive, active and is considered reef safe, making it compatible with coral-dominated aquariums.

• Compatible tankmates: Semi-aggressive community fish of similar size. Introduce simultaneously when possible to reduce territorial aggression.
• Stocking density: Marine fish require more space per individual than freshwater fish.

Thirty gallons is enough for one 3-inch wrasse and small enough that the fish treats the whole box as a territory. It will chase new additions, harass a peaceful goby, and pick at a cleaner shrimp until the shrimp is gone. Beginner care works when the livestock plan includes that behavior: pests are the target, ornamental shrimp are not present, and the other fish are not timid cave dwellers. A six-line in a 30-gallon reef with a firefish and a sexy shrimp is three projects that cancel each other.

Tank Setup & Requirements

A clear picture of this side of Six Line Wrasse care puts you in a better position to make decisions the animal can actually feel. Because each Six Line Wrasse is its own animal, treat any general guideline as a starting point and refine from there.

Tank Specifications

• Minimum size: 30 gallon. Larger is strongly recommended for parameter stability.
• Sump systems recommended for tanks over 50 gallons.
• Water flow: Moderate to strong flow using powerheads or wavemakers. Active swimmers appreciate strong linear flow.
• Lighting: Full-spectrum reef lighting if keeping with corals. LED systems offer energy efficiency and controllable spectrum.
• Aquascaping: Live rock providing caves, overhangs, and swim-through passages. Ensure open swimming space for active species.

Water Parameters

Diet & Nutrition

The Six-Line Wrasse is classified as carnivore. Proper nutrition is essential for maintaining health, coloration, and immune function.

• Primary diet: Carnivore: mysis, brine shrimp, pellets, hunts flatworms.
• Feeding frequency: 2-3 small feedings per day. Small frequent meals are better than one large feeding.
• Variety: Rotate between different food types to ensure complete nutrition. Offer frozen mysis shrimp, brine shrimp, and high-quality pellets.
• Avoid: Overfeeding is the most common feeding mistake.

Proper nutrition for Six-Line Wrasse requires understanding not just what to feed, but how feeding strategies affect health, behavior, and water quality. A disciplined approach to feeding, where your Six-Line Wrasse receives the right amount of appropriate food at consistent intervals, is one of the most impactful things you can do for both the fish and the overall aquarium ecosystem.

Diet variety is essential for optimal Six-Line Wrasse health because no single commercial food provides the complete nutritional profile these marine fish require. Observing your Six-Line Wrasse's response to different food types also provides useful health information, as reduced interest in normally preferred foods is often an early indicator of illness.

Common Health Issues

The most common health concerns for Six-Line Wrasses include:

• Marine ich: Marine ich.
• aggression-related injuries: aggression-related injuries.
• bacterial infections: bacterial infections.
• internal parasites: internal parasites.

They are active through the day and they jump. Fit a lid, because a six-line will use a feeding slot as an exit. A six-line does not need a deep sand bed the way a sand-diving Halichoeres does, but it does need rockwork to hunt through. Feed mysis and pellets so the flatworm work is not the entire diet. A tank with no pests and no feedings will push the wrasse onto whatever small invertebrate remains. Reef safe on the card means corals are generally left alone. It does not mean the reef's shrimp are safe, and it does not mean a second six-line will be tolerated.

Temperature is 72 to 78°F, salinity 1.020 to 1.025, pH 8.1 to 8.4. Nitrate under 10 ppm is the reef target that matches how people usually keep them, and under 20 ppm is the fish-only allowance. Alkalinity of 8 to 12 dKH, calcium of 380 to 450 ppm, and magnesium of 1250 to 1350 ppm sit with the corals. Ammonia and nitrite at 0 ppm are assumed by the beginner label and still have to be true. Expect to pay about 15 to 30 dollars for the wrasse and about 200 to 400 for the setup. Cheap and useful against flatworms is how the fish gets added to tanks that are too small for its temper.

One wrasse, a lid, meaty food, and no prized shrimp is the 30-gallon version that matches the card. The 4-to-6-year lifespan is reasonable for that layout. A six-line that spends the day pinning a goby in a corner is not being active and charming. It is being semi-aggressive in a tank with nowhere else to put the aggression. Move the wrasse, or do not combine it with the fish it is cornering. Pest control is a side effect of a predator, not a personality that stays gentle because the flatworms are gone.

The foundation of Six Line Wrasse health management is water quality — full stop. Regular testing and diligent maintenance are your best tools.

Grooming & Maintenance

• Equipment maintenance: Clean protein skimmer cup 2-3 times weekly. Replace filter media monthly. Calibrate refractometer regularly.
• Algae management: Magnetic algae scrapers for glass cleaning. Clean-up crew (snails, hermit crabs) helps control nuisance algae.
• Water testing: Test salinity, pH, ammonia, nitrite, and nitrate weekly. Test alkalinity, calcium, and magnesium for reef systems.

Cost Overview

The true cost of keeping Six-Line Wrasse extends well beyond the initial purchase price and basic equipment. Many aspiring Six-Line Wrasse keepers underestimate these ongoing costs, which can lead to cut corners that ultimately compromise fish health and result in even greater expenses. A realistic budget that accounts for both routine maintenance and occasional replacement of equipment provides a more accurate picture of what Six-Line Wrasse keeping actually costs.

Insurance Considerations

Is the Six-Line Wrasse reef safe?

The Six-Line Wrasse is rated: Yes. Reef compatibility can vary between individual specimens. Providing adequate feeding can reduce the likelihood of fish picking at corals.

How big of a tank does a Six-Line Wrasse need?

The Six-Line Wrasse requires a minimum tank size of 30 gallon. Larger tanks provide more stable water parameters and reduce territorial aggression. Consider future fish additions when sizing your tank.

What do Six-Line Wrasses eat?

Six-Line Wrasses are classified as carnivore. Feed mysis, brine shrimp, pellets, hunts flatworms. Variety is essential for complete nutrition and maintaining vibrant coloration. Consider using an automatic feeder for consistency.

Are Six-Line Wrasses good for beginners?

Six-Line Wrasses are rated beginner care level.

How long do Six-Line Wrasses live?

Six-Line Wrasses live 4-6 years in captivity with proper care.

Related Marine Species

View all marine fish species →

Six-Line Wrasse May Be Great For:

• A reef keeper who wants Pseudocheilinus hexataenia to eat pyramidellid snails and small pests
• Someone with a covered tank, because six-lines jump
• An aquarist who adds the wrasse late, after shy fish have territory

Six-Line Wrasse May Not Be Ideal For:

• A peaceful nano already stressed by a dottyback or a damsel
• A bare-top tank or a refugium the wrasse can jump into
• Anyone who will add a second six-line to a small reef

Keeping a Six-Line Wrasse is one of those experiences that gets better with time. The first few weeks involve a steep learning curve, but once you establish a routine, the daily care becomes second nature. Most long-term Six-Line Wrasse keepers say they wish they had started sooner.

Pseudocheilinus hexataenia is a small wrasse that eats flatworms and also harasses shrimp and shy fish. It jumps. A lid and a meaty diet are required, and a tank of about 30 gallons or more gives it room to stop pacing the glass. It is a pest eater with a temper, and the temper shows up after it has cleaned out the worms.