Anthias

Anthias are among the most colorful and graceful fish available for marine reef aquariums. Brilliant shades of orange, pink, yellow, purple, red, and lavender combine with constant open-water swimming to create the appearance of a miniature tropical reef inside the home aquarium.

The name anthias refers to a diverse group of reef fishes in the family Anthiadidae. Many of the species best known to aquarists have traditionally been placed in the genus Pseudanthias, although modern taxonomic revisions have moved some familiar species into genera such as Nemanthias and Mirolabrichthys.

Despite their delicate appearance, some anthias can be fairly hardy once established. The main challenge is feeding. These fish naturally spend much of the day picking tiny planktonic organisms from moving water, so they usually perform much better with several small meals throughout the day than with one large feeding.

Anthias can make spectacular reef inhabitants, but choosing the right species is important. Lyretail and Bartlett’s Anthias are generally more adaptable, while species such as Purple Queen and Evans’ Anthias can be considerably more difficult to acclimate and feed.

🐟 Anthias Care at a Glance

Care Requirement	Anthias
Family	Anthiadidae
Common aquarium genera	Pseudanthias, Nemanthias, Mirolabrichthys, Serranocirrhitus and others
Environment	Marine
Natural habitat	Tropical coral reefs
Typical adult size	About 3–6 inches for many aquarium species
Tank size	Species dependent; often 70 gallons or larger
Temperature	About 74–80°F
pH	Approximately 8.1–8.4
Specific gravity	About 1.023–1.026
Diet	Primarily zooplankton and small animal foods
Temperament	Peaceful to moderately territorial
Reef safe	Generally yes
Swimming level	Middle and upper water column
Feeding frequency	Several small meals daily preferred
Care level	Intermediate to advanced depending on species
Social structure	Often female-dominated groups with one male
Reproduction	Pelagic spawning

🌊 Where Do Anthias Live?

Anthias are strongly associated with tropical coral reefs.

Many species inhabit:

• Reef slopes
• Drop-offs
• Coral outcrops
• Lagoons
• Channels
• Current-swept reef faces
• Areas above branching corals

Rather than hiding continuously inside the rocks, many anthias spend much of the day hovering several feet above the reef.

Current carries zooplankton toward the fish, allowing them to pick tiny food particles from the water column almost continuously.

When threatened, the entire group may retreat rapidly toward the reef structure.

This combination of open swimming water plus immediate access to shelter should be reflected in the aquarium.

🌈 Why Are Anthias So Colorful?

Anthias are famous for extraordinary coloration.

Depending on species and sex, they may display combinations of:

• Orange
• Salmon pink
• Hot pink
• Yellow
• Purple
• Lavender
• Red
• Violet
• Blue

Males are frequently much more elaborately colored than females.

They may also develop:

• Longer dorsal-fin rays
• Extended tail filaments
• Different facial markings
• Contrasting patches of color

This difference between the sexes is closely related to their unusual social and reproductive system.

🔬 Anthias Taxonomy

Aquarium literature has traditionally placed many familiar anthias in the genus Pseudanthias and the subfamily Anthiinae within the grouper family Serranidae.

Modern classifications have changed considerably.

Current FishBase and World Register of Marine Species records recognize Anthiadidae as a separate family, and several familiar aquarium species have been reassigned to different genera.

For example:

• Lyretail Anthias remains Pseudanthias squamipinnis
• Bartlett’s Anthias is currently Nemanthias bartlettorum
• Dispar Anthias is currently Nemanthias dispar
• Evans’ Anthias is currently Mirolabrichthys evansi
• Purple Queen Anthias is currently Mirolabrichthys tuka

Older names such as Pseudanthias bartlettorum and Pseudanthias tuka remain extremely common in aquarium stores and hobby literature.

This means you may encounter both old and current scientific names when researching the same fish.

🧡 Popular Types of Anthias

There are numerous anthias in the aquarium trade, and their difficulty varies dramatically.

Anthias	Current Scientific Name	General Aquarium Notes
Lyretail Anthias	Pseudanthias squamipinnis	One of the more adaptable choices
Bartlett’s Anthias	Nemanthias bartlettorum	Colorful and relatively bold
Dispar Anthias	Nemanthias dispar	Smaller, peaceful schooling species
Ignitus Anthias	Pseudanthias ignitus	Bright orange-red coloration
Purple Queen Anthias	Mirolabrichthys tuka	Beautiful but often difficult to feed
Evans’ Anthias	Mirolabrichthys evansi	Striking yellow and violet; demanding
Bimaculatus Anthias	Pseudanthias bimaculatus	Larger and dramatically colored
Sunburst Anthias	Serranocirrhitus latus	More secretive and cave-oriented

Not every anthias should be maintained in exactly the same way.

🧡 Lyretail Anthias

The Lyretail Anthias (Pseudanthias squamipinnis) is one of the best-known members of the group.

It is also called the:

• Sea Goldie
• Scalefin Anthias
• Red Sea Anthias

Females are commonly orange to yellow-orange, while males can develop much deeper red, pink, or purple coloration depending on geographic origin.

Males may reach approximately 6 inches, while females are considerably smaller.

Wild Lyretail Anthias form large aggregations above coral outcrops and reef slopes where they feed on zooplankton.

For aquarists new to anthias, Lyretails are often one of the more realistic species to consider because healthy individuals commonly adapt to prepared aquarium foods more readily than highly specialized species.

💛 Bartlett’s Anthias

The Bartlett’s Anthias (Nemanthias bartlettorum) is another popular aquarium species.

It remains relatively compact at around 3.5 inches and features a beautiful mixture of:

• Yellow
• Lavender
• Pink
• Magenta

Wild Bartlett’s Anthias may form large groups containing relatively few males and numerous females and juveniles.

They are generally bold aquarium feeders once established.

However, their social hierarchy can become intense in confined spaces, particularly when several individuals begin transitioning toward male coloration.

🧡 Dispar Anthias

The Dispar Anthias (Nemanthias dispar) is a smaller, elegant anthias with orange, pink, yellow, and lavender coloration.

It is generally more understated than a mature male Lyretail but can look spectacular in a group.

Dispar Anthias are often maintained in peaceful reef communities with:

• Plenty of open swimming space
• Strong water movement
• Rockwork for retreat
• Frequent feeding

Like most anthias, they are best kept away from highly aggressive fish that prevent them from feeding comfortably.

🔥 Ignitus Anthias

The Ignitus Anthias (Pseudanthias ignitus), sometimes called the Flame Anthias, develops fiery shades of orange, red, and pink.

It naturally occurs around Indo-West Pacific reef environments and remains relatively small.

A group swimming above branching coral can create one of the most striking displays possible in a reef aquarium.

They benefit from:

• Frequent small meals
• Strong oxygenation
• Open swimming space
• Peaceful companions
• Stable reef conditions

💜 Purple Queen Anthias

The Purple Queen Anthias is famous for breathtaking purple, yellow, pink, and violet coloration.

It is also one of the anthias that aquarists should approach cautiously.

Currently classified as Mirolabrichthys tuka, it was long known as Pseudanthias tuka.

Wild fish feed heavily on tiny planktonic organisms and may be reluctant to recognize ordinary aquarium foods.

Some specimens arrive in captivity and simply refuse:

• Pellets
• Flakes
• Large frozen foods

Successful acclimation may require tiny foods such as:

• Copepods
• Small mysis
• Fish eggs
• Calanus
• Enriched Artemia
• Other fine zooplankton substitutes

This species is much better suited to experienced reef keepers than to someone choosing their first anthias.

💛 Evans’ Anthias

Evans’ Anthias, currently classified as Mirolabrichthys evansi, is another beautiful but relatively demanding species.

Its coloration combines brilliant yellow with lavender, violet, and pink.

Wild fish form schools around outer reef slopes and feed on passing zooplankton.

Like the Purple Queen, Evans’ Anthias can be difficult to acclimate to prepared foods.

A large mature reef aquarium capable of providing frequent tiny meals gives them the best chance of long-term success.

🌅 Sunburst Anthias

The Sunburst Anthias is somewhat different from the typical open-water anthias.

Scientifically known as Serranocirrhitus latus, it is also called the:

• Fathead Anthias
• Hawkfish Anthias
• Swallowtail Basslet

Rather than spending all day hovering over a reef in a large school, Sunburst Anthias tend to remain closer to:

• Caves
• Overhangs
• Ledges
• Shaded rockwork

They can even swim upside down beneath ledges.

This species appreciates subdued areas and may initially remain hidden when introduced to a brightly lit reef aquarium.

📏 How Big Do Anthias Get?

Adult size varies greatly.

Many popular aquarium species remain around 3–5 inches, although some males may reach approximately 6 inches or more.

Examples include:

• Bartlett’s Anthias — around 3.5 inches
• Purple Queen Anthias — around 4–5 inches
• Evans’ Anthias — around 5 inches
• Lyretail Anthias — males up to around 6 inches
• Sunburst Anthias — around 5 inches

The aquarium should be planned around the adult male size rather than the size of a juvenile female at the store.

🏡 Anthias Tank Size

Anthias need significantly more swimming room than their body size might suggest.

For many commonly kept species, 70 gallons or larger is a useful starting point.

Groups and larger species often benefit from:

• 90 gallons
• 120 gallons
• 150 gallons or more

Tank shape is important.

A long aquarium with plenty of horizontal swimming space is preferable to an unusually tall tank with the same volume.

Anthias spend a great deal of time moving through open water rather than sitting in one small territory.

🪸 Setting Up an Anthias Aquarium

A good anthias aquarium should combine open water with extensive reef structure.

Useful features include:

• Live rock
• Caves
• Overhangs
• Branching structures
• Open swimming areas
• Strong circulation
• Good oxygenation
• Stable reef conditions

Do not fill every inch of the tank with rock.

Anthias need room to swim above and around the reef.

At the same time, every fish should be able to disappear quickly into shelter when frightened.

🌊 Water Movement

Anthias generally appreciate moderate to strong reef-style circulation.

Wild schools frequently congregate around areas where currents deliver plankton.

Good water movement also helps maintain:

• Oxygenation
• Gas exchange
• Food suspension
• Reef water quality

Rather than blasting the fish with one narrow powerhead, create broad turbulent flow throughout the aquarium.

Provide some calmer areas behind rocks so fish can rest when necessary.

💧 Anthias Water Parameters

Anthias require stable marine water conditions.

A useful general range is:

• Temperature: 74–80°F
• pH: 8.1–8.4
• Specific gravity: 1.023–1.026
• Ammonia: 0 ppm
• Nitrite: 0 ppm
• Nitrate: Keep appropriately low

A specific gravity around 1.025–1.026 closely approximates natural tropical seawater and works particularly well in reef systems.

Anthias generally perform poorly when exposed to repeated swings in:

• Salinity
• Temperature
• pH
• Oxygen levels

Good stability is far more important than constantly adjusting the aquarium to chase tiny numerical differences.

🍽️ What Do Anthias Eat?

Most aquarium anthias are primarily zooplanktivores.

In nature, they hover in moving water and pick small animals from the current.

Natural foods may include:

• Copepods
• Small crustaceans
• Zooplankton
• Fish eggs
• Tiny larvae
• Other planktonic organisms

Good aquarium foods include:

• Mysis shrimp
• Enriched brine shrimp
• Copepods
• Calanus
• Fish eggs
• Finely chopped marine foods
• Small marine pellets
• Quality marine flakes

Food should generally be small enough to resemble the particles anthias naturally capture in the water column.

⏰ How Often Should You Feed Anthias?

Feeding frequency is one of the most important differences between anthias and many ordinary reef fish.

In nature, they feed in small amounts throughout much of the day.

A single large feeding in the evening does not reproduce that pattern very well.

Aim for several small meals per day when possible.

A practical schedule might include:

• Morning frozen food
• Midday pellet feeding
• Afternoon automatic-feeder portion
• Evening frozen food

Not every keeper can manually feed four times every day.

An automatic feeder containing appropriately sized pellets can make anthias care much easier.

🤖 Automatic Feeders for Anthias

Anthias are excellent candidates for automatic feeders.

The device can dispense tiny amounts of food once or several times while the aquarist is away.

This helps prevent the pattern of:

1. Long periods without food
2. One enormous meal
3. Excess food falling into the reef
4. Rising nutrient levels

Use very small portions.

The goal is to create multiple light feeding opportunities, not multiple full meals.

⚠️ Why Anthias Can Starve in Aquariums

An anthias can sometimes appear healthy for weeks while gradually losing body mass.

The problem is especially common with newly imported fish.

Wild anthias are accustomed to waiting in the current for small food particles to arrive repeatedly.

In an aquarium they suddenly encounter:

• Large chunks of frozen food
• Pellets they do not recognize
• Aggressive feeding competitors
• Only one or two feeding opportunities per day

Some adapt quickly.

Others do not.

Watch the abdomen closely.

A healthy anthias should remain well filled out rather than developing a pinched or hollow belly.

🧊 Getting New Anthias to Eat

If a new anthias refuses pellets, begin with foods that move or drift naturally.

Useful choices include:

• Live copepods
• Live Artemia
• Frozen cyclops
• Calanus
• Small mysis
• Fish eggs
• Finely chopped seafood

Once the fish is feeding reliably, gradually introduce prepared foods alongside familiar items.

Do not make conversion to pellets the immediate priority.

The first goal is simply to get the fish eating enough calories consistently.

🧠 Anthias Social Structure

Anthias have one of the most fascinating social systems among reef fishes.

Many popular species naturally form groups containing:

• One dominant male
• Several females
• Juveniles

The male maintains his position through displaying and occasional chasing.

Females also establish their own hierarchy.

This social structure is closely connected to the fish’s ability to change sex.

♀️ Do Anthias Change Sex?

Yes.

Many commonly kept anthias are protogynous hermaphrodites.

They begin adult life as females.

When a dominant male disappears, the highest-ranking female may begin transitioning into a male.

The change can involve:

• New coloration
• Elongated fins
• Behavioral changes
• Increased territoriality
• Reproductive transformation

Over time, a fish that looked unmistakably female may become a fully functional male.

This is one of the most remarkable behaviors that can be observed in a marine aquarium.

♂️ Can Two Anthias Become Males?

Yes—and this can create problems in aquariums.

Social hierarchies are less stable in a small tank than they are on an enormous coral reef.

More than one dominant female may begin transitioning toward male characteristics.

If two males develop, aggression can increase considerably.

This is especially important with species such as Bartlett’s Anthias.

Aquarists keeping groups should monitor for:

• Increased chasing
• Rapid color changes
• Fin development
• One fish becoming isolated
• A subordinate fish hiding constantly

👥 How Many Anthias Should You Keep?

There is no universal answer.

Some species can be kept singly.

Others display their most natural behavior in groups.

A traditional arrangement is:

One male with several females.

However, small aquarium groups can sometimes develop serious hierarchy problems.

For many home aquariums, keeping:

• One anthias
• A compatible pair
• A carefully chosen group of females

may be easier than trying to recreate a large wild harem.

If starting with several females, one may naturally transition into the dominant male.

The larger the group, the larger the aquarium should be.

😠 Are Anthias Aggressive?

Most anthias are not aggressive toward unrelated reef fish.

Within their own group, however, they can be surprisingly assertive.

Common behavior includes:

• Chasing
• Displaying
• Fin flaring
• Brief nipping
• Establishing rank

Some of this is normal.

The concern is persistent one-sided aggression.

A fish that is constantly chased into hiding may stop feeding and eventually weaken.

Provide:

• Plenty of swimming space
• Numerous escape routes
• Complex rockwork
• Multiple feeding locations

Aggression is usually easier to manage in a large aquarium.

🐠 Best Anthias Tank Mates

Anthias generally work beautifully in peaceful-to-moderately-active reef communities.

Possible companions include:

• Clownfish
• Blue Chromis
• Bicolor Blenny
• Goby Fish
• Orchid Dottyback
• Peaceful wrasses
• Tangs in suitably large aquariums
• Rabbitfish
• Cardinalfish
• Peaceful dwarf angelfish

The ideal companions are active enough to coexist with anthias without constantly intimidating them.

⚠️ Tank Mates to Avoid

Avoid combining delicate anthias with:

• Large predatory groupers
• Highly aggressive triggers
• Large predatory wrasses
• Extremely territorial damselfish in confined tanks
• Fish that monopolize every feeding
• Species capable of swallowing them

A particularly aggressive Zebra Damsel may create problems for newly introduced or timid anthias in a small aquarium.

The biggest danger is not always physical injury.

A stressed anthias that refuses to leave shelter at feeding time can starve.

🪸 Are Anthias Reef Safe?

Yes. Most commonly kept anthias are considered excellent reef fish.

They generally do not eat:

• Corals
• Tridacnid clams
• Snails
• Hermit crabs
• Large ornamental shrimp

Their natural diet consists mainly of planktonic foods captured from the water column.

This makes anthias especially attractive for coral reef displays because their open-water swimming complements corals rather than threatening them.

🦐 Can Anthias Live With Shrimp?

Generally, yes.

Large ornamental shrimp such as cleaner shrimp are normally safe with appropriately sized anthias.

Extremely tiny crustaceans and larvae may be eaten because anthias naturally consume zooplankton.

This is expected feeding behavior rather than deliberate predation on adult ornamental shrimp.

🪸 Anthias and Coral

Anthias look particularly natural swimming above:

• Acropora
• Montipora
• Large SPS colonies
• Reef ledges
• Branching rock structures

They do not require living coral to survive.

However, complex reef structure recreates the type of shelter they naturally use when danger approaches.

Anthias hovering above brightly colored branching coral can produce one of the most authentic-looking displays in a marine aquarium.

🌙 Where Do Anthias Sleep?

At night, anthias generally stop their open-water schooling behavior and retreat into reef structure.

They may sleep:

• Between rocks
• Inside caves
• Beneath overhangs
• Among coral branches

Some individuals become noticeably darker or duller at night.

This is usually normal.

Make sure every fish has enough shelter so weaker members of a group are not forced to remain exposed.

🏃 Do Anthias Jump?

Yes.

Anthias are capable jumpers, particularly when:

• Newly introduced
• Chased
• Frightened
• Disturbed after dark

A secure mesh lid is strongly recommended.

Check gaps around:

• Power cords
• Overflow boxes
• Filter pipes
• Feeding openings

Many otherwise healthy reef fish are lost through surprisingly small openings.

💨 Oxygenation and Anthias

Good dissolved oxygen levels are important.

Anthias naturally inhabit open reef environments where water movement can be substantial.

An aquarium should provide good gas exchange through:

• Surface movement
• Powerheads
• Return pumps
• Protein skimming
• Proper circulation

This becomes especially important in heavily stocked reef tanks where anthias are being fed frequently.

Warm water, high fish density, and heavy feeding all increase the importance of good oxygenation.

🧹 Filtration for Anthias Tanks

Frequent feeding creates a challenge.

Anthias benefit from more food entering the aquarium, but excess food also increases:

• Nitrate
• Phosphate
• Dissolved organic waste
• Algae growth

Strong filtration helps balance the fish’s nutritional needs with reef water quality.

Useful equipment can include:

• Protein skimmer
• Mechanical filtration
• Biological filtration
• Refugium
• Filter socks or rollers
• Adequate live rock

The goal should not be to feed less than the fish require.

Instead, build a filtration system capable of supporting appropriate feeding.

🏪 Choosing Healthy Anthias

Take time when selecting anthias at the aquarium store.

Look for fish that:

• Are actively swimming
• Have full abdomens
• Breathe normally
• Hold fins open
• Show clear eyes
• Have intact scales
• Respond to food

Whenever possible, ask to see the fish eat.

This is particularly important with difficult species.

Avoid anthias showing:

• Severely sunken bellies
• Rapid breathing
• Persistent hiding
• Open sores
• Cloudy eyes
• White spots
• Inability to compete for food

A healthy, feeding specimen is worth considerably more than a spectacular fish that refuses every food offered.

🧪 Acclimating Anthias

New anthias can be stressed by:

• Shipping
• Capture
• Bright lighting
• New tank mates
• Different foods
• New social hierarchies

Provide a quiet acclimation period.

Dim the aquarium lights and make sure the fish has easy access to shelter.

Offering small live or frozen foods shortly after introduction can help establish a feeding response.

Some experienced aquarists acclimate difficult anthias in a separate quarantine or conditioning aquarium where feeding can be closely monitored without competition.

🩺 Common Health Concerns

Anthias can develop the same infectious and parasitic conditions seen in other marine fish.

Potential problems include:

• Marine ich
• Marine velvet
• Flukes
• Bacterial infections
• Internal parasites
• Nutritional wasting

Warning signs include:

• Rapid breathing
• White spots
• Scratching
• Frayed fins
• Loss of appetite
• Hollow abdomen
• Color loss
• Isolation from the group

Quarantining new marine fish before adding them to a valuable reef aquarium can greatly reduce disease risk.

❤️ Anthias Lifespan

There is no single lifespan that applies to every anthias species.

With excellent care, many can remain aquarium residents for several years.

Long-term success depends heavily on:

• Consistent feeding
• Appropriate social structure
• Good water quality
• Proper tank size
• Low chronic stress
• Disease prevention

Underfeeding is one of the most preventable causes of long-term failure.

♀️ Male vs. Female Anthias

Male and female appearance varies by species.

In many popular anthias:

Males

Often have:

• Larger adult size
• More intense coloration
• Longer fins
• Extended dorsal rays
• More elaborate tail shape
• Greater territorial behavior

Females

Often have:

• Smaller bodies
• Simpler fin shapes
• Orange, yellow, or pink coloration
• Less elaborate markings

Because females can later become males, these differences are not permanently fixed throughout life.

🥚 How Do Anthias Breed?

Anthias are generally pelagic spawners.

Rather than attaching eggs to rocks or guarding a nest, a male courts females in open water.

Spawning commonly occurs toward evening.

During a spawning rise:

1. The male displays to a female.
2. The pair swims upward into the water column.
3. Eggs and sperm are released.
4. Fertilized eggs drift in the plankton.
5. Larvae eventually hatch and continue a planktonic existence.

There is no parental care after spawning.

🐣 Can Anthias Be Bred in Aquariums?

Spawning behavior can occur in large reef aquariums, but raising the larvae is considerably more difficult.

Anthias larvae are tiny and require specialized foods.

Successful marine larval culture may involve:

• Rotifers
• Copepod nauplii
• Phytoplankton
• Carefully maintained larval tanks
• Progressive food-size changes

For most home aquarists, simply observing courtship and spawning behavior is already a fascinating achievement.

🆚 Anthias vs. Chromis

Anthias and Blue Chromis can both create colorful open-water movement in reef aquariums.

However, they differ in several ways.

Anthias

• Usually pink, orange, purple, or yellow
• Feed heavily on zooplankton
• Benefit from frequent meals
• Often form harems
• Many species change from female to male

Chromis

• Frequently blue or blue-green
• Belong to the damselfish family
• Generally easier to feed
• Often maintained as shoaling fish
• Usually less demanding nutritionally

For aquarists wanting the easiest possible open-water reef fish, Chromis may be simpler.

Anthias provide more dramatic social and sexual behavior.

🆚 Anthias vs. Damselfish

Although both groups inhabit coral reefs, their aquarium personalities can be very different.

Many anthias are:

• Social
• Open-water swimmers
• Frequent plankton feeders
• Relatively peaceful toward unrelated fish

Many damselfish are:

• Strongly territorial
• Closely associated with specific reef structures
• Less demanding about feeding frequency
• Often more aggressive

A fish such as the Zebra Damsel is typically much tougher socially than a delicate anthias.

🌟 Best Anthias for Beginners

No anthias is quite as effortless as a hardy clownfish or damselfish, but some are more manageable than others.

Good introductory candidates often include:

Lyretail Anthias

One of the most adaptable and widely available options.

Bartlett’s Anthias

Usually bold and willing to eat once settled, although group dynamics require attention.

Dispar Anthias

A relatively small and peaceful choice for an appropriately sized reef aquarium.

Aquarists should still be prepared to provide multiple feedings and monitor body condition carefully.

⚠️ Anthias for Experienced Aquarists

Some species are much more demanding.

These include:

Purple Queen Anthias

Famous for refusing prepared foods and slowly starving if acclimation is unsuccessful.

Evans’ Anthias

Beautiful but often demanding about food size and feeding frequency.

Deepwater Anthias

Certain deeper-water species may need:

• Lower light
• Cooler temperatures
• Specialized acclimation
• Additional decompression considerations during collection

Do not select anthias based only on color.

The most spectacular species are sometimes the least forgiving.

✅ Are Anthias Good Beginner Fish?

For someone’s first saltwater aquarium, anthias are generally not the easiest choice.

Their main challenges include:

• Frequent feeding
• Social hierarchy
• Need for large swimming areas
• Sensitivity during acclimation
• High oxygen demand
• Increased nutrient load from feeding

An aquarist who already understands reef filtration, quarantine, water stability, and marine feeding can have excellent success.

If you are new to saltwater fish, Clownfish are usually easier.

🌸 Are Anthias Right for Your Reef Aquarium?

Anthias can transform a reef aquarium.

Instead of having every fish hide among the rocks, a group of anthias creates continuous movement above the coral, closely resembling the appearance of a natural tropical reef.

They are particularly well suited to:

• Large reef aquariums
• SPS coral displays
• Tanks with strong circulation
• Peaceful marine communities
• Aquarists able to feed several times daily
• Fishkeepers interested in social hierarchies and sex change

Their greatest requirement is food.

A beautiful anthias that receives only one hurried feeding each day may slowly decline even when every water parameter appears perfect.

Choose an appropriate species, begin with healthy individuals that are already eating, provide plenty of swimming room and shelter, maintain excellent water quality, and offer frequent small meals throughout the day.

Under those conditions, anthias can become some of the most spectacular and behaviorally fascinating fish in a reef aquarium.

❓ Frequently Asked Questions

What are anthias?

Anthias are colorful marine reef fishes belonging to the family Anthiadidae. Many popular aquarium species were traditionally classified within Pseudanthias, although modern taxonomy places some in other genera.

How big do anthias get?

Many commonly kept species reach around 3–6 inches, although adult size varies considerably.

What size tank do anthias need?

Many anthias are best housed in aquariums of around 70 gallons or larger, with considerably more space recommended for groups and larger species.

Are anthias reef safe?

Yes. Most popular anthias are considered excellent reef-safe fish and generally leave corals and ornamental invertebrates alone.

What do anthias eat?

Most anthias are zooplankton feeders. Good aquarium foods include mysis shrimp, copepods, Calanus, brine shrimp, fish eggs, small pellets, and other finely sized marine foods.

How often should anthias be fed?

Several small meals each day are preferable. Frequent feeding better matches their natural plankton-feeding behavior.

Can anthias live alone?

Some species can be kept singly. Others display more natural behavior in groups, but social aggression must be carefully managed.

How many female anthias should be kept with a male?

Traditional groups contain one male and several females, but the appropriate number depends strongly on species and aquarium size.

Do anthias change sex?

Yes. Many aquarium anthias are protogynous hermaphrodites. Females can transition into males when social conditions favor the change.

Will a female anthias become male?

It can. If the dominant male disappears, a high-ranking female may begin changing into a male.

Can two male anthias live together?

Sometimes in very large groups and aquariums, but multiple males may fight. Keeping a single male is generally simpler in typical home aquariums.

Are Lyretail Anthias easy to keep?

They are among the more adaptable anthias, although they still require frequent feeding and good water quality.

Why is my anthias hiding?

New fish may hide because of shipping stress, aggressive tank mates, bright lighting, or unfamiliar surroundings. Persistent hiding combined with failure to eat requires attention.

Why is my anthias losing weight?

Insufficient food intake is a common cause. Anthias often need multiple small meals and may struggle to compete with aggressive feeders.

Do anthias jump?

Yes. A secure aquarium lid or mesh cover is strongly recommended.

Can anthias breed in reef tanks?

Courtship and spawning can occur, but raising the tiny planktonic larvae is considerably more difficult.

🔗 Related Articles

• Blue Chromis
• Chromis
• Zebra Damsel
• Clownfish
• Goby Fish
• Bicolor Blenny
• Orchid Dottyback
• Butterflyfish
• Surgeonfish
• Blue Chromis

📚 Sources

• FishBase — Anthiadidae Family Summary
• FishBase — Pseudanthias squamipinnis Species Summary
• World Register of Marine Species — Pseudanthias squamipinnis
• FishBase — Nemanthias bartlettorum Species Summary
• FishBase — Mirolabrichthys tuka Species Summary
• FishBase — Mirolabrichthys evansi Species Summary
• FishBase — Serranocirrhitus latus Species Summary
• Reef Builders — Acclimating Anthias to Aquarium Life