Saltwater Fish

Flame Hawkfish

Neocirrhites armatus

Scarlet coral-percher with black bandit eyesIntermediate

Lifespan: 5-10 years
Size: 3.5 in
Social needs: One per tank (bonded pair only in a large system)
Time: 15-20 min daily; reef-standard upkeep
Cost: High
Diet: Carnivore (frozen mysis, brine, krill, chopped seafood)

Overview

What is this animal?

The flame hawkfish is a small, solid scarlet-red hawkfish marked with black rings around the eyes and a black band running along the base of the dorsal fin.
At about 3.5 in it is one of the smaller hawkfish commonly kept, and it comes from western and central Pacific surge zones where it lives wedged inside heads of branching Pocillopora and Stylophora coral.

Where the longnose hawkfish perches high and surveys the reef, the flame lives low, tucked into branches near the rock, and is noticeably more secretive for its first weeks.

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It is hardy and full of character once settled, and its bulldog face and pure red colour make it one of the most striking small marine fish.

Flame hawkfish on sale are wild-caught, mostly from Fiji and nearby Pacific reefs, which keeps prices well above a clownfish.
A university lab has spawned the species, but as of 2024 no one had reported raising the larvae beyond about two weeks old, so there is no captive-bred stock to wait for; buy from a supplier who can tell you where and how the fish was collected.

Temperament

A settled flame hawkfish is bold, watchful, and quickly learns to recognise its keeper, but it is a genuine predator of small invertebrates.
Ornamental shrimp, small hermit crabs, and small snails are at real risk, so build the cleanup crew from larger snails and skip cleaner and sexy shrimp and tiny hermits entirely.

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It defends its patch of rockwork and can bully small bottom-dwellers such as gobies, blennies, and firefish, especially in smaller tanks.
Add the hawkfish last, after peaceful fish have established, and give it its own branching territory.

Keep one hawkfish per tank as a rule.
Flame hawkfish are protogynous hermaphrodites, so a bonded male-female pair can live together, but only in a large system with plenty of rock; two unpaired fish will fight over the best perch until one is hurt.
With medium-sized, confident tankmates a single hawkfish causes little trouble and spends its day hopping between lookout points.

A good fit for

Reef keepers wanting an intense splash of red
Reefs from 80 gal upward
Fans of perching, watchful personality fish
Coral-dominated tanks without prized ornamental shrimp
Keepers willing to wait for a responsibly collected, already-feeding fish

Common mistakes to avoid

Shrimp, small hermits, and snails become prey
Open lids: hawkfish are explosive jumpers
Two unpaired hawkfish fight; only a bonded pair cohabits, in a large tank
Adding it before shy bottom-dwellers have settled
Buying a shipping-stressed fish that never feeds

Enclosure

Minimum 79 gallons

One of its kind per tank; other compatible species can share it. One per tank (bonded pair only in a large system)

Provide a cycled reef of at least 80 gallons with dense branching rockwork or sturdy branching coral set low in the tank, because this hawkfish wedges into structure rather than perching in the open.
It needs little swimming room, and care references give 30-40 gallons, but the extra volume gives it more lookout points and its smaller tankmates more room to keep away.
Like all hawkfish it lacks a swim bladder, so it rests on its pectoral fins and moves in short hops instead of cruising.

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Keep salinity 1.024-1.026, temperature 75-80°F, pH 8.1-8.4, ammonia and nitrite at zero, and nitrate below 20 ppm.
As a surge-zone native it appreciates strong flow and will happily sit in currents that would exhaust more delicate fish.

A tight-fitting lid is non-negotiable, since startled hawkfish are explosive jumpers and jumping is the most common cause of loss.
It will not nip corals, though it may irritate a small SPS colony by perching on the same spot day after day.

Check your enclosure

Supplies

Setup

Tank, stand and sump
Return pump and powerheads
Protein skimmer
Reef lighting
Rock and sand

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Salt mix, refractometer and test kits
Quarantine tank

Ongoing

Frozen mysis shrimp
Frozen krill
Frozen enriched brine shrimp
Frozen chopped seafood blend
Marine carnivore pellets

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Feeding tongs
Small thawing cup and strainer

Safe substrate: Aragonite sand · Dry or cured live rock

Work out the cost

Care routine

Daily

Check salinity, temperature and flow
Check the lid
Feed
Head-count and look everyone over
Top up evaporation with fresh water

Every few days

Service the skimmer and filter socksevery 3 days

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Weekly

Clean the glass
Test the water
Water change

Monthly

Calibrate the refractometer
Check salt, RO/DI and reagents

Less often

Deep-clean pumps and powerheadsevery 3 months
Replace RO/DI filter mediaevery 6 months

Health review: Quarterly review with a lid check, every 3 months

Tools

Is your enclosure big enough?Check your measurements against the recommended size What will it cost?Setup, monthly and over its whole life, itemised Is this ammonia reading dangerous?Works out the toxic part from your pH and temperature

Care in depth

Diet

Carnivore (frozen mysis, brine, krill, chopped seafood)

Flame hawkfish are carnivores that ambush small crustaceans in the wild.
Feed frozen mysis, enriched brine shrimp, krill, and finely chopped fresh seafood once or twice daily, and most individuals learn to take a marine carnivore pellet within a few weeks.

New arrivals often hide and refuse food for the first several days, which is normal, but confirm the fish is eating at the shop before you buy, because shipping-stressed wild-caught specimens sometimes never start.
Target-feeding near its favourite crevice helps a shy newcomer compete.

Vary the menu rather than relying on one food, and remove anything uneaten.
Remember that it will also feed itself on any tank crustacean small enough to crack, so do not count the cleanup crew as part of its diet plan.

Health

Signs of good health, and the common problems

This is one of the tougher marine fish, with good parasite resistance and a calm response to the minor parameter swings that would stress delicate species.
Quarantining new arrivals for 3-4 weeks remains best practice all the same.

Most flame hawkfish losses are not disease at all but jumping through an open lid or starvation in fish that were already failing at import.
Choose an alert, actively feeding specimen with full body weight behind the head and no pinched belly.

With stable water and a varied diet a flame hawkfish commonly lives 5-10 years, and well-kept individuals can go longer.
Watch for the standard marine warning signs of scratching, white spots, or rapid breathing, and treat in a separate hospital tank rather than dosing the reef.

Is this urgent?

6 warning signs and how fast to act, 3 of them right away

In a reef, stability matters more than any single target number. A parameter moving fast does more damage than a parameter sitting slightly off.

Go now

Any detectable ammonia or nitriteWater change now with matched, mixed and aerated saltwater. Stop feeding. Ammonia is directly toxic, and at reef pH more of it is in the toxic form, so a marine system has less margin than a freshwater one. Nitrite is far less toxic in seawater, but any reading in a stocked tank means the biological filter is not keeping up.

Now

Temperature or salinity has moved sharplyCorrect slowly, over hours, not minutes. Check the heater and the top-off. The speed of the change does the damage. Correcting fast repeats the injury in the other direction.

Now

Rapid gilling, or a fish hanging in the flow breathing hardIncrease aeration and check temperature and salinity. Warm water holds less oxygen, and a heater failure shows up here first.

Now

Today

White spots, or a fine dusting like icing sugarIdentify which parasite before treating. Most reef tanks cannot be treated in place. The two common parasites look similar and need different handling; velvet can kill a tank in days.

Today

Corals closed for more than a day, or receding tissueTest alkalinity first, and compare it against the last reading rather than a target. Unstable alkalinity is the most commonly cited coral killer, and a swing shows up in the trend, never in a single point.

Today

A new fish added without quarantine now looks unwellRemove it to a separate system today if you can. Nearly every wipeout in a reef tank traces back to a skipped quarantine.

Today

Quarantine every new animal, including corals and inverts. It is the single practice that separates a reef that lasts from a reef that restarts.

This is general guidance for a healthy adult, not a diagnosis. An exotics vet who knows your animal always overrides it, and the time to find one is before you need one.

Bedding and substrate

2 safe, 3 with a caveat, 2 to avoid

In a marine system the rock and the sand are life support, and how you start them decides the first six months.

Safe

Aragonite sandThe standard marine substrate, and it hosts the biology. It does not meaningfully hold pH or alkalinity at normal reef pH, so test and dose for those regardless.

safe

Dry or cured live rockDry rock avoids importing pests but takes longer to mature. Cured rock is faster and riskier.

safe

With a caveat

Deep sand bedsPowerful nutrient processing when they work and a sulphide release when they are disturbed. Choose shallow or deep deliberately, not by accident. A sand-sifting or burrowing goby needs a fine bed about 2 to 3 in deep that it turns over itself. That is a different thing from a denitrifying deep sand bed (4 in or more, left undisturbed), and the two do not mix: a sifting goby disturbs the layers a deep sand bed depends on and eats the life in it.

with a caveat

Uncured live rockIt will cycle the tank for you, and it will also bring in whatever was living in it.

with a caveat

Bare bottomWorkable in high-flow systems for fish that neither sift nor burrow, but it removes a large part of the biological buffer. Wrong for watchman gobies and other gobies that burrow or sift, which need a fine sand bed at least 2 in deep to dig and feed in, and for mandarins and other copepod-eaters, which need sand as well as mature rock for their food to breed in.

with a caveat

Never

Silica play sandNot the marine standard, and commonly blamed for feeding diatom blooms in a new tank.

never

Any rock or decor of unknown originMetals and phosphate leach for months and are almost impossible to trace once the tank is running.

never

This is our general list for saltwater fish. We have not built one specific to Hawkfish yet.

Top resources for more info

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