Six-Line Wrasse: A Complete Guide to Care and Compatibility

Six-line wrasse – (Pseudocheilinus hexataenia) | Vojce

Small, brilliantly colored, constantly active, and packed with personality, the Six-Line Wrasse is one of the most recognizable wrasses in the marine aquarium hobby.

The Six-Line Wrasse (Pseudocheilinus hexataenia) earns its name from the six vivid horizontal blue-purple stripes running across its orange to reddish body. Add a bright green tail, expressive red-orange eyes, and an almost nonstop habit of weaving through rockwork, and it is easy to understand the appeal.

Yet the Six-Line Wrasse comes with an important warning.

This is a small fish with a surprisingly large personality.

Six-Lines can be hardy, reef compatible, and excellent hunters of tiny crustaceans living among live rock—but established individuals may also become territorial toward timid fish, other wrasses, and new additions.

A successful Six-Line Wrasse aquarium therefore depends just as much on stocking order and tank-mate selection as it does on water quality and feeding.

⚡ Six-Line Wrasse Quick Care Guide

Care Requirement	Six-Line Wrasse
Scientific name	Pseudocheilinus hexataenia
Common names	Six-Line Wrasse, Sixline Wrasse, Sixstripe Wrasse
Family	Labridae
Origin	Indo-Pacific, including the Red Sea
Adult size	About 3–4 inches; maximum around 4 inches (10 cm)
Recommended tank size	55–60+ gallons for most community setups
Care level	Beginner to intermediate
Temperament	Semi-aggressive to aggressive
Temperature	About 72–78°F
pH	Approximately 8.1–8.4
Specific gravity	Approximately 1.020–1.025
Alkalinity	About 8–12 dKH
Diet	Carnivore
Reef safe?	Generally yes, with caution around very small crustaceans
Swimming level	Throughout rockwork and reef structure
Breeding	Egg layer; paired spawning
Sand bed required?	No
Special consideration	Can bully peaceful fish; secure lid recommended

Although a Six-Line can physically live in a smaller aquarium, a larger tank provides significantly more territory and escape space when other fish are present.

🔬 Scientific Classification

Classification	Six-Line Wrasse
Kingdom	Animalia
Phylum	Chordata
Class	Actinopterygii
Family	Labridae
Subfamily	Cirrhilabrinae
Genus	Pseudocheilinus
Species	Pseudocheilinus hexataenia

The Six-Line belongs to Labridae, the enormous wrasse family.

It is related to hundreds of other wrasses ranging from tiny reef species to very large fishes, but Pseudocheilinus species are particularly well known in aquariums for combining compact size with assertive behavior.

FishBase records a maximum length of approximately 10 cm, or just under 4 inches.

🌏 Where Do Six-Line Wrasses Live?

The Six-Line Wrasse has an enormous Indo-Pacific distribution.

Its natural range extends from:

The Red Sea
Eastern Africa
South Africa
The Indian Ocean
Southeast Asia
The western Pacific
The Ryukyu Islands
The Tuamotu Islands
Lord Howe Island
The Austral Islands

That huge geographic range helps explain why the species is familiar to divers throughout much of the tropical Indo-Pacific.

FishBase records the species from depths of approximately 1–35 meters.

🪸 Natural Six-Line Wrasse Habitat

Wild Six-Line Wrasses are strongly associated with dense coral reef structure.

They commonly inhabit:

Coral branches
Reef slopes
Reef crests
Coral rubble
Crevices
Clear coastal reef environments

Rather than swimming far out into open water, a Six-Line spends much of its time weaving through the reef.

This behavior translates directly to aquarium care.

A Six-Line aquarium should contain plenty of:

Live rock
Holes
Tunnels
Overhangs
Crevices
Small passages

The fish should be able to disappear into the aquascape and emerge somewhere entirely different moments later.

Wild individuals feed primarily on small crustaceans while moving through reef structure.

🌈 What Does a Six-Line Wrasse Look Like?

The Six-Line Wrasse may be small, but its coloration is remarkably intricate.

The body usually displays an orange, reddish, or pinkish background crossed by six horizontal blue to purple stripes.

Other distinctive features include:

Bright reddish-orange eyes
Blue-green highlights
A greenish tail
Fine markings around the face
A small dark eyespot near the base of the tail
A streamlined, compressed body

The eyespot is particularly interesting because it can potentially confuse predators about which end of the fish is the head.

Its six stripes and tail spot make Pseudocheilinus hexataenia relatively easy to identify once you know what to look for.

📏 How Big Do Six-Line Wrasses Get?

Six-Line Wrasses remain relatively small.

Most aquarium specimens reach roughly 3 inches, while wild individuals can reach around 4 inches or 10 cm.

Their modest body size sometimes leads aquarists to assume they are ideal nano fish.

That can be misleading.

A Six-Line may be small physically, but it is:

Very active
Highly maneuverable
Territorial
Constantly investigating rockwork

Space is valuable primarily because it gives both the wrasse and its tank mates room to establish separate territories.

🏡 Six-Line Wrasse Tank Size

You will see recommendations as low as 30 gallons for a Six-Line Wrasse.

For a lightly stocked aquarium containing one Six-Line and carefully selected companions, that can sometimes work.

For a typical community reef, however, I prefer 55–60 gallons or larger.

LiveAquaria currently lists 60 gallons as its minimum tank-size specification, although its accompanying care text also references 30 gallons.

The larger recommendation makes sense because aggression—not adult body length—is often the limiting factor.

More space provides:

Additional territories
More hiding places
Longer escape routes
More live rock for foraging
Reduced competition
Better options for tank mates

If you want a peaceful community with several small reef fish, giving the Six-Line extra room is worthwhile.

🪨 Aquascaping for a Six-Line Wrasse

Rock structure is extremely important.

A good aquascape should have complex three-dimensional reef structure rather than one solid wall of tightly packed rock.

Create:

Arches
Narrow passages
Small caves
Overhangs
Separate rock islands
Spaces behind structures

At the same time, leave enough open space for other fish to swim normally.

Complex rockwork helps break lines of sight.

That can be particularly valuable if the Six-Line begins chasing another fish because the target can disappear around or through the reef rather than remaining visible across the entire aquarium.

🏖️ Does a Six-Line Wrasse Need Sand?

No.

This is an important distinction between Six-Line Wrasses and several other aquarium wrasses.

Many wrasses in genera such as Halichoeres bury themselves in sand to sleep or hide.

Six-Line Wrasses generally retreat into rockwork instead.

You can keep one in:

A sand-bottom reef
A bare-bottom aquarium
A mixed reef with rubble

without needing a deep sand bed specifically for the wrasse.

A secure network of rock crevices is far more important.

😴 How Do Six-Line Wrasses Sleep?

Six-Line Wrasses retreat into protected reef structure at night.

Wrasses in the genus Pseudocheilinus have also been reported to produce a mucus cocoon around themselves while sleeping.

The mucus covering may help reduce detection by nocturnal predators.

This unusual sleeping behavior is shared with some other wrasses and parrotfishes.

So if your Six-Line vanishes completely once the aquarium lights go out, that is usually normal.

🚀 Can Six-Line Wrasses Jump?

Yes.

Six-Line Wrasses are quick, powerful little fish and can jump from an aquarium.

A secure mesh top or lid is strongly recommended.

Pay particular attention to:

Overflow openings
Cord gaps
Feeding openings
Corners
Spaces around plumbing

Their small body allows them to fit through surprisingly narrow gaps.

Aggression can make jumping even more likely because a fish being chased may launch toward the surface while trying to escape.

TFH specifically warns about the tendency of Pseudocheilinus wrasses to jump through small openings.

🌡️ Six-Line Wrasse Water Parameters

Six-Line Wrasses thrive under stable standard reef conditions.

Water Parameter	Recommended Range
Temperature	72–78°F
pH	8.1–8.4
Specific gravity	1.020–1.025
Alkalinity	About 8–12 dKH
Ammonia	0 ppm
Nitrite	0 ppm

The species is relatively hardy by reef-fish standards, but that does not make unstable water acceptable.

Consistency is especially important when introducing a new fish after shipping and acclimation stress.

💧 Water Quality and Maintenance

Maintain a Six-Line aquarium with:

Reliable biological filtration
Regular partial water changes
Good circulation
Appropriate mechanical filtration
Salinity monitoring
Routine nitrate testing
Equipment maintenance

A mature reef aquarium offers another advantage: established live rock contains countless tiny organisms that the wrasse can hunt throughout the day.

This gives the fish both food and behavioral enrichment.

🍽️ What Do Six-Line Wrasses Eat?

Six-Line Wrasses are carnivorous micropredators.

Wild individuals feed primarily on small crustaceans and other tiny organisms living around coral and reef rubble. FishBase specifically identifies small crustaceans as a major component of the natural diet.

Aquarium foods can include:

Mysis shrimp
Enriched brine shrimp
Copepods
Small krill pieces
Finely chopped marine seafood
Quality carnivore pellets
Marine flakes
Frozen plankton blends

Most established Six-Lines develop excellent appetites.

🦐 Six-Line Wrasses Are Constant Hunters

One of the most entertaining things about keeping this species is watching it forage.

A Six-Line may spend the entire day:

Examining holes in rock
Turning sharply between coral branches
Picking tiny animals from surfaces
Investigating rubble
Searching crevices

Its small size and incredible maneuverability allow it to access spaces that larger reef fish cannot.

This is genuine natural behavior rather than aimless swimming.

🪱 Will Six-Line Wrasses Eat Aquarium Pests?

They may.

Six-Line Wrasses have a reputation for eating organisms such as:

Small bristleworms
Flatworms
Tiny crustaceans
Certain parasitic snails
Other small invertebrates

LiveAquaria notes that they may consume pyramidellid snails and unwanted organisms associated with live rock.

However, there is an important caveat:

Do not buy a Six-Line solely as pest control.

There is no guarantee that one individual will eat the exact pest bothering your aquarium.

You are also acquiring a fish that may live for years and influence the social structure of the entire tank.

Choose it because you actually want a Six-Line Wrasse.

🧹 Can a Six-Line Wrasse Act as a Cleaner Fish?

Occasionally.

Six-Line Wrasses have been observed removing parasites from other fish and may behave as facultative cleaners, particularly when young.

That means cleaning is something they can do rather than something they must do for survival.

They are very different from an obligate cleaner species such as some populations of Cleaner Wrasse.

Research and observations have documented occasional cleaning behavior in Pseudocheilinus hexataenia.

Do not rely on a Six-Line to control fish parasites in an aquarium.

Proper quarantine and treatment remain essential.

⚔️ Are Six-Line Wrasses Aggressive?

They certainly can be.

This is the most important compatibility issue with the species.

Some Six-Lines coexist with tank mates for years with relatively little trouble.

Others gradually become the neighborhood bully.

Potential behaviors include:

Chasing
Charging
Nipping
Territorial displays
Preventing timid fish from feeding
Pursuing newcomers
Attacking other wrasses

Aggression often becomes more noticeable as the fish matures and becomes comfortable with the aquarium.

A Six-Line that initially spends weeks hiding may eventually behave as though the entire reef belongs to it.

🧠 Why Can Such a Small Fish Be So Aggressive?

Natural ecology offers part of the explanation.

Six-Line Wrasses spend their lives navigating complex reef structure where access to:

Shelter
Food
Territory

matters.

Inside an aquarium, those boundaries are compressed.

An established fish can quickly learn every cave and passage and may begin controlling access to substantial portions of the rockwork.

Its extraordinary speed makes avoiding it difficult for slower tank mates.

This is why a three-inch Six-Line can sometimes create more compatibility trouble than a much larger fish.

🐠 Best Six-Line Wrasse Tank Mates

The best companions are generally fish that are:

Confident
Not easily intimidated
Too large to be relentlessly bullied
Not extremely similar in shape
Not competing for exactly the same rockwork

Possible companions in appropriately sized systems include:

Ocellaris Clownfish
Larger clownfish
Some dwarf angelfish
Tangs
Cardinalfish
Moderately assertive gobies
Certain blennies
Other robust reef fishes

Your Ocellaris Clownfish can work in a sufficiently large aquarium, particularly if the clownfish is established first.

Compatibility always depends on individual temperament.

🚫 Fish to Avoid With a Six-Line Wrasse

Use particular caution with very peaceful or timid species.

Potential victims include:

Firefish
Small fairy wrasses
Flasher wrasses
Small dartfish
Timid gobies
Shy basslets
Newly introduced small fish
Other Pseudocheilinus wrasses

TFH specifically notes that Pseudocheilinus species can harass rock-associated fishes such as dartfish, grammas, and other small wrasses.

That means combining a Six-Line with your Firefish Goby or Royal Gramma deserves extra caution.

In a large reef, an individual combination may succeed.

In a small aquarium, I would choose safer companions.

🐟 Six-Line Wrasse With Other Wrasses

This can be particularly difficult.

Six-Lines may show strong aggression toward other wrasses, especially:

Smaller wrasses
Peaceful fairy wrasses
Flasher wrasses
Other lined wrasses
Fish introduced after the Six-Line

TFH describes the Six-Line as one of the more antagonistic members of Pseudocheilinus.

If you want a diverse wrasse collection, a Six-Line may not be the best starting species.

Once established, it may make introducing gentler wrasses considerably harder.

🕐 When Should You Add a Six-Line Wrasse?

In a community reef, I generally prefer adding the Six-Line later rather than first.

This gives peaceful residents time to:

Establish territories
Learn the rockwork
Become confident feeders

before the Six-Line claims the aquarium.

Adding a Six-Line early can allow it to become deeply established and view every future addition as an intruder.

Stocking order cannot guarantee peaceful behavior, but it can improve the odds.

🔄 What If Your Six-Line Starts Bullying Other Fish?

Several strategies may help.

Try:

Rearranging portions of the rockwork
Adding visual barriers
Increasing feeding locations
Using an acclimation box for newcomers
Temporarily isolating the aggressor
Moving the Six-Line to another aquarium if necessary

An acclimation box can be particularly useful because existing fish can see the newcomer without immediately attacking it.

Persistent aggression should not be allowed to continue indefinitely.

A target fish that spends every day hiding may eventually stop eating and decline.

👥 Can You Keep Two Six-Line Wrasses Together?

For most home aquariums, one is enough.

Wild Six-Line Wrasses may occur in loose groups, but aquarium conditions are dramatically more confined.

Multiple Pseudocheilinus wrasses can become aggressive toward one another.

Keeping more than one would require:

Considerably more space
Extensive rockwork
Careful introduction
A contingency plan

Even then, compatibility is not guaranteed.

A single specimen is much safer for the average reef keeper.

🪸 Is the Six-Line Wrasse Reef Safe?

Six-Line Wrasses are generally considered reef safe with corals.

They do not normally eat:

SPS corals
LPS corals
Soft corals
Zoanthids

This makes them attractive choices for reef systems.

However, “reef safe” does not necessarily mean every tiny invertebrate is safe.

🦐 Will a Six-Line Wrasse Eat Shrimp?

Large established ornamental shrimp are often left alone, but very small crustaceans may become prey.

Remember that the natural diet consists largely of small crustaceans.

Potential prey may include:

Tiny shrimp
Newly introduced shrimp juveniles
Small amphipods
Copepods
Very small crabs
Other microcrustaceans

TFH also notes that small ornamental shrimp may occasionally be vulnerable, particularly during molting.

If keeping expensive tiny ornamental crustaceans is your priority, the Six-Line may not be the safest choice.

🐚 Will Six-Line Wrasses Harm Snails or Clams?

Usually not, but caution is appropriate.

Six-Lines are sometimes intentionally kept because they hunt small parasitic snails around clams.

They may occasionally investigate very small mollusks while searching for prey.

Healthy adult snails and established clams are not generally considered normal prey, but individual behavior varies.

This is another reason reef safe with caution is sometimes more useful than a simple yes-or-no label.

🩺 Common Six-Line Wrasse Health Problems

Six-Line Wrasses are fairly hardy but can still develop common marine fish diseases.

Potential problems include:

Marine ich
Marine velvet
Flukes
Internal parasites
Bacterial infections
Physical injuries from aggression

Warning signs include:

Rapid breathing
White spots
Scratching
Loss of appetite
Cloudy eyes
Frayed fins
Weight loss
Persistent hiding
Abnormal swimming

Because Six-Lines naturally spend considerable time among the rocks, hiding alone is not necessarily evidence of disease.

Look for a change from the fish’s normal pattern.

🧪 Quarantining a Six-Line Wrasse

Quarantine is a sensible practice.

During quarantine, monitor:

Appetite
Breathing
Skin
Fins
Feces
Swimming
Parasites

Provide hiding places such as:

PVC elbows
Short pipe sections
Inert artificial caves

A bare quarantine tank without any shelter can leave a rock-oriented wrasse feeling extremely exposed.

And keep the quarantine tank covered.

🛡️ Keeping a Six-Line Healthy

The fundamentals are simple:

Stable salinity
Zero ammonia
Zero nitrite
A varied carnivorous diet
Mature rockwork
Plenty of hiding places
Compatible tank mates
Regular maintenance
Secure aquarium cover

A well-fed Six-Line in a mature reef aquarium can be remarkably hardy.

Compatibility problems are often more likely than husbandry problems.

❤️ Six-Line Wrasse Breeding

Six-Line Wrasses are egg-laying fish.

FishBase describes the species as oviparous and records distinct pairing during breeding.

Like many marine wrasses, reproduction ultimately produces tiny pelagic eggs and larvae that are extremely difficult to raise successfully in a normal home aquarium.

Breeding is therefore not comparable to species such as clownfish that lay adhesive eggs on a surface and guard a nest.

♀️♂️ Male vs. Female Six-Line Wrasse

Sexing individual Six-Line Wrasses by appearance is difficult for the average aquarist.

Males may become especially colorful during courtship, but there is no simple, dependable visual feature equivalent to the sword on a male Swordtail or the size difference of a bonded Ocellaris Clownfish pair.

Because the reproductive biology of Pseudocheilinus is less straightforward in captivity, avoid assuming that two differently sized specimens automatically represent a compatible male and female.

🧠 Fascinating Six-Line Wrasse Facts

It Really Has Six Lines

The blue-purple horizontal bands that give the fish its name are among its most reliable identification features.

It Has a False Eyespot

A dark spot near the base of the tail may help confuse predators.

It Hunts All Day

Six-Lines constantly inspect live rock for tiny crustaceans and other edible organisms.

It May Occasionally Clean Other Fish

Juveniles in particular can display facultative cleaning behavior.

It Doesn’t Need Sand to Sleep

Unlike many other aquarium wrasses, the Six-Line retreats into rockwork.

It May Sleep in a Mucus Cocoon

Members of Pseudocheilinus can surround themselves with mucus when resting.

It Is Tiny but Fearless

Few marine fish illustrate the difference between size and temperament better.

It Has an Enormous Natural Range

The species occurs from the Red Sea and East Africa across much of the tropical Indo-Pacific.

It Is Considered Least Concern

FishBase currently lists the Six-Line Wrasse as Least Concern based on its IUCN assessment.

⚠️ Common Six-Line Wrasse Care Mistakes

Choosing It Only for Pest Control

It may eat pests—but it may not eat yours.

Choose the fish because you actually want to keep it.

Underestimating Aggression

This is probably the biggest mistake.

A three-inch fish can make life miserable for several peaceful tank mates.

Adding It First

Allow gentler species to establish themselves before introducing the Six-Line when possible.

Keeping It With Timid Wrasses

Six-Lines can be especially hard on peaceful fairy and flasher wrasses.

Using a Bare Aquarium

Provide abundant rockwork for hiding and natural foraging.

Leaving the Tank Uncovered

Wrasses can jump.

Assuming It Needs a Deep Sand Bed

Six-Lines use reef crevices rather than routinely burying themselves like many sand-sleeping wrasses.

Keeping Multiple Six-Lines in a Small Tank

Conspecific aggression can become serious.

Assuming “Reef Safe” Means Every Invertebrate Is Safe

Tiny crustaceans may become food.

🌟 Are Six-Line Wrasses Good for Beginners?

This is a qualified yes.

From a basic husbandry standpoint, Six-Line Wrasses have several beginner-friendly qualities:

Hardy
Small
Easy to feed
Widely available
Reef compatible
Adaptable
Active
Usually resistant to minor husbandry mistakes once established

But compatibility complicates the picture.

A beginner building a peaceful community around:

Firefish
Tiny gobies
Fairy wrasses
Shy basslets

may be happier choosing another species.

The Six-Line is best for an aquarist prepared to manage its territorial personality.

🤔 Should You Get a Six-Line Wrasse?

A Six-Line may be an excellent choice if you want:

A small but extremely active reef fish
Brilliant coloration
Constant natural foraging behavior
A fish that explores every part of the rockwork
A hardy wrasse
A species with plenty of personality

It may be a poor choice if your aquarium contains:

Very timid fish
Multiple peaceful wrasses
Tiny ornamental crustaceans
Limited hiding space
A small community where bullying would be difficult to escape

This is one of those fish where compatibility planning matters more than the difficulty rating on a care sheet.

💙 Is the Six-Line Wrasse Worth Keeping?

For the right aquarium, absolutely.

A healthy Six-Line Wrasse is rarely boring.

It spends almost every waking moment weaving between rocks, inspecting surfaces, searching for crustaceans, and patrolling the reef with extraordinary speed and agility.

Its six brilliant stripes provide plenty of color without requiring a large fish.

But the Six-Line should never be chosen simply because it is small and hardy.

Its assertive temperament can dramatically affect the rest of the aquarium.

Give it enough room, complex rockwork, appropriate food, a secure cover, and tank mates capable of sharing space with a confident wrasse.

Under those conditions, Pseudocheilinus hexataenia can become one of the most entertaining small fishes in a marine aquarium.

🌊 Final Thoughts

The Six-Line Wrasse is a perfect example of why choosing marine fish based solely on size can be misleading.

At only three or four inches long, it looks like an easy addition to almost any reef.

Physically, it is.

Socially, things can be more complicated.

The Six-Line is hardy, beautifully colored, reef compatible, easy to feed, and fascinating to watch. Its natural habit of weaving through coral structure and hunting tiny crustaceans makes it one of the busiest fish in an established reef aquarium.

But it can also become territorial enough to intimidate peaceful tank mates.

The best Six-Line aquarium therefore combines ample space, abundant rockwork, a varied meaty diet, carefully chosen companions, sensible stocking order, and a secure lid.

Plan for its personality as carefully as you plan for its physical needs, and this tiny striped wrasse can be an exceptional reef resident.