Saltwater Fish · Clownfish
True Percula Clownfish
Amphiprion percula
The "true" clownfish, inked with bold black bordersBeginner
- Lifespan
- 10-20 years (exceptionally long-lived)
- Size
- 2.5-4 in6-11 cm; female larger
- Social needs
- Single fish or one bonded pair; never unbonded clowns
- Time
- Daily feeding; weekly water testing and changes
- Cost
- High (designer morphs cost more again)
- Diet
- Omnivore (marine pellets, frozen mysis/brine, algae)
Overview
What is this animal?
- The True Percula, a trade name for the species otherwise known as the orange clownfish, is the near-identical sibling of the Ocellaris, which the trade sells as the "false percula".
- You tell them apart by the Percula's thicker black borders around its white bars, its slightly more saturated orange, its bright orange iris that makes the eye look smaller, and its 10 dorsal-fin spines to the Ocellaris's 11.
- It comes from a smaller wild range than the Ocellaris, centred on Papua New Guinea, the Solomon Islands, and the northern Great Barrier Reef.
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- Captive-bred Perculas are widely available, including designer morphs such as Picasso and Platinum, and captive-bred is the only stock worth buying.
- Wild-caught Perculas ship poorly and are notoriously prone to Brooklynella, so a wild fish is a firm not yet for a beginner.
- Between the two look-alikes, the Ocellaris is marginally hardier and cheaper, so choose the Percula for its bolder markings, not because it is easier or longer-lived.
- Both are long-lived fish, and captive Ocellaris have been recorded alive past 20 years.
Temperament
- Young Perculas are as mild as Ocellaris, but an established pair, and especially the female, defends its chosen patch more sharply, chasing fish and nipping hands that come too close during maintenance.
- This is still nothing like the Maroon's aggression, and it stays confined to a small territory.
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- They are reef-safe and ignore corals, though a pair may irritate one specific coral by wallowing in it as an anemone substitute.
- All clownfish are protandrous (male-first) sequential hermaphrodites, and the dominant fish of a pair turns into the larger female; the change is one-way, so a bonded pair is permanent.
- Keep one fish or one bonded pair only, and never mix clownfish species or add a second unbonded clown, because the resident pair will attack it.
- Their bold waggling swim and habit of greeting the keeper at the glass make them one of the most interactive marine fish.
A good fit for
- Reef tanks (reef-safe)
- First or second marine fish, if captive-bred
- Keepers wanting bolder markings than an Ocellaris
- Long-haul keepers ready for a 15-20 year fish
- Larger reefs, where a pair keeps to one small patch
Common mistakes to avoid
- Wild-caught stock - Brooklynella-prone; insist on captive-bred
- Paying Percula prices for a mislabelled Ocellaris
- Buying a demanding anemone the fish does not need
- No lid - clownfish jump
- Adding a second clownfish to an established pair's tank
- Underestimating a 15-20 year commitment
Enclosure
Minimum 79 gallons300 litres
Fine alone or with company. Single fish or one bonded pair; never unbonded clowns
- A fully cycled tank of at least 80 gal300 L, 3 ft90 cm or more from end to end, suits a single fish or a bonded pair (these are small, sedentary clowns that claim one patch of reef and rarely leave it), with live rock for territory and a tight-fitting lid because clownfish jump.
- Maintain salinity 1.024-1.026, temperature 75-80°F24-27°C, pH 8.1-8.4, ammonia and nitrite at zero, and nitrate below 20 ppm (lower still if you keep corals).
- Stability matters more than perfection, and a large volume of water buffers the swings a small reef is prone to, so invest in a reliable heater, a powerhead for flow, and a proper test kit before the fish.
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- No anemone is required, despite the pairing everyone pictures.
- The Percula's natural hosts are the magnificent sea anemone, the leathery (sebae) anemone and the giant carpet anemone.
- They need intense lighting and a mature tank, and they kill fish in systems that cannot support them.
- In the wild a Percula rarely strays more than 39 inchesa metre from its host, so in captivity the pair will claim one small patch of rock or coral and largely ignore the rest of the tank.
Supplies
Setup
- Tank, stand and sump, about 80-90 US gallons300-340 litres
- Return pump and powerheads
- Protein skimmer
- Reef lighting
- Rock and sand
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- Salt mix, refractometer and test kits
- Quarantine tank
Ongoing
- Quality small marine pellet
- Frozen mysis shrimp
- Frozen enriched brine shrimp
- Algae-based marine flake
- Vitamin or HUFA soaking supplement
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- Small thawing cup and strainer
- Turkey baster for target-feeding
Safe substrate: Aragonite sand · Dry or cured live rock
Care routine
Daily
- Check salinity, temperature and flow
- Feed small marine portions
- 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
- Watch the pair's pecking order
- 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 pair check, every 3 months
Tools
Care in depth
Diet
Omnivore (marine pellets, frozen mysis/brine, algae)
- Perculas are omnivores that graze on zooplankton and algae in the wild.
- Offer a quality marine pellet or flake as the staple, rotated with frozen mysis, enriched brine shrimp, and an algae-based food such as spirulina flake.
- Feed small amounts once or twice daily, only what the fish clear in a couple of minutes, because uneaten food is the fastest route to high nitrate.
- Captive-bred Perculas take prepared foods from day one, so refusal to eat usually signals stress or disease rather than pickiness.
- Soak frozen foods in a vitamin supplement occasionally to support colour and immune health.
- They are slower, more deliberate feeders than many tankmates, so make sure faster fish are not stripping the water column before the clowns get their share.
Health
Signs of good health, and the common problems
- The Percula's defining health risk is Brooklynella, the parasite nicknamed "clownfish disease", which shows as peeling slime, laboured breathing, and rapid decline and, as with other clownfish, hits wild-caught fish hardest.
- Buying captive-bred stock and quarantining every new arrival for four to six weeks removes most of that risk.
- Marine ich (white spots, scratching against rock) and the faster-killing marine velvet (a fine gold or grey dusting, rapid breathing) are the other common parasites.
- Stable salinity and temperature are the real medicine, because nearly every clownfish disease outbreak follows a stress event such as a swing, a move, or a new aggressive tankmate.
- A well-kept Percula is a genuinely long commitment, with 15 to 20 years realistic in captivity, and wild females estimated, from survival data, to live around 30 years on the same anemone.
- Plan for the fish to outlast most dogs before you buy it.
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.
NowTemperature 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.
NowRapid 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.
NowToday
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.
TodayCorals 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.
TodayA 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.
TodayQuarantine 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.
safeDry or cured live rockDry rock avoids importing pests but takes longer to mature. Cured rock is faster and riskier.
safeWith 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 in5 to 8 cm deep that it turns over itself. That is a different thing from a denitrifying deep sand bed (4 in10 cm 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 caveatUncured live rockIt will cycle the tank for you, and it will also bring in whatever was living in it.
with a caveatBare 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 in5 cm 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 caveatNever
Silica play sandNot the marine standard, and commonly blamed for feeding diatom blooms in a new tank.
neverAny rock or decor of unknown originMetals and phosphate leach for months and are almost impossible to trace once the tank is running.
neverThis is our general list for saltwater fish. We have not built one specific to Clownfish yet.
Top resources for more info
Independent creators and organisations we would send a friend to. We have no affiliation with any of them, and nothing here is sponsored. Links checked 2026-10-22.
YouTubers
HumbleFish & ReefSaltwater fish disease, quarantine and treatment (Humble.Fish forum)BRStvReef tank setup, fish health and quarantine series (run by a retailer)FishOfHex AquaticsBeginner saltwater guides, avoiding common mistakes and tank disasters
Sites
Keep going
Clownfish, side by side
Same axes, same care guides: the honest way to choose between types.
