The Ultimate Clownfish Care Guide: 30 Species, Tank Setup, Breeding, Anemones, and Designer Strain Pricing

What is a clownfish?

A clownfish is a small reef-dwelling marine fish in the genera Amphiprion (29 species) and Premnas (1 species, the Maroon clownfish). They are native to the warm waters of the Indian Ocean and western Pacific from East Africa to French Polynesia, including the Red Sea, the Great Barrier Reef, and the Coral Triangle. All 30 species form a symbiotic relationship with sea anemones in the wild and are protected from anemone stings by a mucus coating on their skin.

Clownfish first entered the saltwater aquarium hobby in the 1950s as wild-caught specimens. Since the 1970s, captive-bred fish from breeders like ORA (Oceans Reefs and Aquariums), Sea and Reef Aquaculture, C-Quest, and Biota Aquariums have dominated the market for hobbyist supply. The 2003 release of Disney's Finding Nemo caused a significant spike in demand and unfortunately also a spike in unsustainable wild collection, particularly of the false percula A. ocellaris. Today over 95 percent of clownfish entering the US hobby are captive-bred, making them one of the most sustainable saltwater fish you can keep.

Clownfish are pomacentrids (damselfish family) and share many behaviors with their relatives: territorial defense of a host, hierarchical pair structure, and aggressive defense of eggs during spawning. The technical name "anemonefish" is more accurate biologically because the symbiosis with anemones is the defining trait of the group, but "clownfish" remains the dominant common name in the hobby and the pet trade.

How many species of clownfish are there?

There are 30 recognized species of clownfish: 29 in the genus Amphiprion and 1 in the genus Premnas (the Maroon clownfish). Of these 30 species, six are routinely available in the US aquarium hobby - Ocellaris, Percula, Tomato, Clarkii, Maroon, and Skunk - and another eight appear seasonally from captive breeders. Wild-caught specimens of rare species (McCulloch's, Latezonatus, Chrysogaster) appear occasionally at premium prices.

The six common clownfish species in the US hobby

Less common species seen in the hobby

These eight species appear seasonally from captive breeders or rarely from sustainable wild collection: Saddleback (A. polymnus), Pink Skunk relatives (A. akallopisos, A. sandaracinos), Sebae (A. sebae), Allard's (A. allardi), Two-band (A. bicinctus), Mauritian (A. chrysogaster), and McCulloch's (A. mccullochi). Most of these run 80 to 250 dollars per fish when available, and most require larger tanks than the common species because of higher aggression or larger adult size.

Why Ocellaris and Percula dominate the trade

Ocellaris and Percula are the two species most people picture when they hear "clownfish" because they were the Nemo. They are also the easiest to breed in captivity, the most peaceful, the smallest adult size, and the most tolerant of beginner mistakes. The two species are visually nearly identical but Percula has slightly thicker black outlines and a more variable orange shade. Ocellaris is what 90 percent of designer strains (Snowflake, Black Ice, Wyoming White, Mocha Storm, Davinci) are bred from.

What tank size do clownfish need?

A single Ocellaris or Percula clownfish needs a minimum 20-gallon saltwater tank. A bonded pair needs 30 gallons. Tomato or Clarkii pairs need 40 gallons. A Maroon pair needs 55 gallons minimum and 75 gallons recommended because of female aggression toward the male in cramped quarters. The tank shape matters too: clownfish use the upper third of the water column, so a 20-gallon long or a 29-gallon cube provides more usable territory than a 20-gallon tall.

Why 10-gallon and 5-gallon nano tanks are not enough

You will see Ocellaris kept in 10-gallon and even 5-gallon pico-reefs online. They survive in these volumes but their adult body size, lifespan, and breeding success drop significantly. Nano-kept clownfish typically reach 2.2 inches instead of 3.0, live 4 to 6 years instead of 8 to 12, and rarely pair or breed. The stress comes from territorial pressure - a clownfish defends a 4 to 6 square foot zone in the wild, which a 10-gallon does not provide.

Tank shape recommendations

• 20-gallon long (30 x 12 x 12). Better than 20-gallon tall. Single Ocellaris with a small cleanup crew.
• 29-gallon cube or 30-gallon breeder (36 x 18 x 12). Best small-format pair tank for Ocellaris or Percula. Room for a bubble-tip anemone too.
• 55-gallon (48 x 13 x 21). Holds a Maroon pair with peaceful tankmates. Avoid for community reef builds because the narrow footprint stresses everything.
• 75-gallon (48 x 18 x 21) or larger. Reef-tank standard. Multiple clownfish, mixed reef fish, multiple anemones.

What water parameters do clownfish need?

Salinity 1.024 to 1.026 specific gravity (33 to 35 parts per thousand), temperature 76 to 80 degrees Fahrenheit, pH 8.1 to 8.4, alkalinity 8 to 11 dKH, calcium 380 to 450 ppm, magnesium 1280 to 1350 ppm, ammonia 0 ppm, nitrite 0 ppm, nitrate under 10 ppm for reef tanks and under 25 ppm for fish-only systems. Phosphate under 0.06 ppm if corals or anemones are present.

Why stability beats perfection

A pH of 8.0 that holds steady for months stresses a clownfish less than a pH that bounces between 8.1 and 8.4 across a single day. Most clownfish deaths in established tanks trace to parameter volatility from inconsistent water changes, untested top-off water, or a failing reactor. Buy a refractometer (not a hydrometer), test ammonia, nitrite, nitrate, alkalinity weekly, and use auto-top-off with RO/DI water to keep salinity stable as evaporation removes pure water but leaves salt behind.

Common parameter test kits

• Salifert - hobby gold standard for nitrate, phosphate, alkalinity, calcium, magnesium
• Hanna Instruments - digital colorimeter for alkalinity, phosphate, nitrate (HI774 for ultra-low phosphate is essential for reefs)
• API Saltwater Master Kit - acceptable for ammonia and nitrite, inaccurate for nitrate in saltwater above 20 ppm
• Red Sea Marine Care - reasonable starter kit, less precise than Salifert but cheaper

What equipment do clownfish need?

A clownfish tank needs heating (100-200W heater with controller), filtration (hang-on-back or canister at 4-6x display turnover), water circulation (powerhead at 10-15x turnover), lighting (LED or T5 at 30-50 PAR for fish-only, 100-250 PAR for reef), saltwater (mixed from sea-salt powder + RO/DI water), test kits, and a refractometer. Protein skimmers are recommended above 30 gallons but not strictly required for a single fish.

Minimum equipment list with 2026 pricing

Total realistic startup cost for a 30-gallon clownfish reef: 900 to 2,000 dollars depending on lighting and powerhead choices. A fish-only 20-gallon can be assembled for 400 to 600 dollars.

What do clownfish eat?

Clownfish are omnivores. In the wild they eat zooplankton, copepods, algae scraped from rocks, and small invertebrates. In captivity they accept a varied diet of high-quality marine pellets, frozen mysis shrimp, frozen brine shrimp enriched with Selcon, and dried nori or spirulina flakes. Feed twice daily, only what they can consume in 30 seconds. Captive-bred clownfish accept dry food immediately; wild-caught fish often need frozen-only for several weeks.

Recommended foods for clownfish

Feeding schedule

• Adults. 2 feedings per day, 30 seconds of consumption per feeding. Mix pellets and frozen on alternate feedings.
• Juveniles (under 1 inch). 3-4 small feedings per day. Crushed pellets or baby brine shrimp.
• Breeding pairs. 3 feedings per day, heavy on frozen mysis and Selcon-enriched brine shrimp. Conditioning takes 4-6 weeks before first spawn.

Foods to avoid

Tubifex worms (parasite vectors), bloodworms (cause fatty-liver in marine fish over time), beef heart (saltwater fish cannot process mammalian fat efficiently), and freeze-dried foods as a primary diet (lack vitamins). Use freeze-dried only as an occasional treat or for travel feeding.

Which anemones host clownfish?

Ten anemone species host clownfish naturally. The most common in the hobby are Bubble Tip Anemone (Entacmaea quadricolor), Magnificent Anemone (Heteractis magnifica), and the three Carpet anemones (Stichodactyla gigantea, S. haddoni, S. mertensii). Specific clownfish species have evolved with specific anemones - the host matrix below maps every recognized pairing. A wild Ocellaris hosts in Magnifica or Gigantea carpet; a wild Maroon hosts only in Bubble Tip.

The clownfish-anemone host matrix

Lighting and care for host anemones

Anemones are photosynthetic - they host zooxanthellae and need lighting comparable to mixed reef corals. Bubble Tip Anemone is the most beginner-friendly (PAR 100-200, accepts blue-heavy or mixed spectrum). Magnificent and Carpet anemones require PAR 250-350 and pristine water (NO3 under 5, PO4 under 0.04, stable parameters). Anemones move; they walk around the tank until they find a spot they like, sometimes for weeks. Block intakes with sponge guards because a wandering anemone in a powerhead is a catastrophic mess.

Should I get an anemone for my clownfish?

Only after your tank has been running stable for 6 months minimum. Anemones are reef-grade livestock that require established stability. A clownfish does not need an anemone; the anemone needs a stable tank. Captive-bred clownfish raised in tanks without anemones often refuse to host one when introduced - they have no instinct for it. If your goal is a clownfish hosting an anemone, buy wild-collected Bubble Tip and pair with a wild-type clownfish (not a designer strain).

Which fish are compatible with clownfish?

Compatible tankmates for clownfish include peaceful reef fish that occupy different territories and do not compete for the host anemone. Best matches are gobies, blennies, basslets, peaceful wrasses, cardinalfish, anthias, dragonets, and small angelfish (Dwarf Cherub or Coral Beauty in larger tanks). Avoid other anemonefish (territorial conflict), large angels (pick at anemones), aggressive triggers, lionfish (eat small clownfish), and damselfish other than the clownfish itself (intra-family aggression).

Compatible tankmates by tank size

Tankmates to avoid

• Other anemonefish species. Two different clownfish species in the same tank will fight, often to the death. Stick to one species per tank.
• Large angels. French, Queen, Emperor, Majestic angels nip at anemone tentacles and harass clownfish. Dwarf angels (Cherub, Coral Beauty) can work in 55+ gallons.
• Triggers and puffers. Most are too aggressive. Some (Niger Trigger, Pinktail Trigger) tolerate clownfish in large tanks but stress the host anemone.
• Lionfish and scorpionfish. Predators on small fish including clownfish.
• Damselfish (non-clownfish). Three Stripe, Domino, Blue Damsel - aggressive cousins that bully clownfish.
• Cleaner wrasses (Labroides). Do not survive in captivity long-term and often die in 30-90 days. Use cleaner shrimp instead.

Do clownfish change sex?

Yes. All clownfish are protandrous sequential hermaphrodites, meaning every fish is born male and the dominant individual in a group transitions to female. The change is irreversible. In a pair, the larger fish is the female; if she dies, the male transitions to female over several weeks and a new male is recruited from any subordinate or new addition. This biology is responsible for clownfish behavior - the size-based hierarchy, intra-pair aggression, and the fact that you cannot add two adults to a tank.

What this means for keepers

• Buy juveniles together. Two captive-bred juveniles introduced at the same time and size will pair-bond within 7-14 days. One becomes female, the other stays male.
• Never add to an established adult. The resident female will attack and kill any newcomer. Even adding a small juvenile to a 6-month established adult is risky.
• If the female dies. The male will become female over 4-12 weeks. After the transition completes, a new juvenile can be added and will become the male of the new pair.
• Same-species only. Different clownfish species do not pair-bond. Two Ocellaris together work; an Ocellaris and a Maroon will fight to the death.

How do clownfish breed?

A bonded pair of mature clownfish (12-18 months old for Ocellaris, 18-24 months for Maroon) chooses a flat vertical or horizontal surface near their host, the female cleans it for several days, then lays 100 to 1,500 orange eggs in a tight cluster. The male fertilizes externally and then fans the clutch with his pectoral fins for 6 to 11 days at 78 F until hatching. Larvae are planktonic, must be moved to a separate larval rearing tank, and require rotifers then baby brine shrimp until metamorphosis at 14-25 days post-hatch.

The full breeding protocol

1. Establish a bonded pair. Buy two captive-bred juveniles of the same species and size. House together in 30+ gallons. Wait 12-18 months for sexual maturity.
2. Condition the pair. Feed 3 times daily with frozen mysis, Selcon-soaked brine, and quality pellets for 4-6 weeks before expected spawning.
3. Provide a spawning surface. A clay pot inverted near the anemone or host coral, a tile, or a flat live rock face. The female prefers a surface 4 to 8 square inches.
4. Observe the spawning ritual. Twice daily the pair cleans the chosen surface for 3-5 days before laying. Spawning typically happens in the afternoon, lasts 1-2 hours, and produces orange eggs in a 1-2 inch diameter cluster.
5. Watch the male fan. The male defends and fans continuously for 6-11 days. Eggs darken from orange to silver as embryos develop. Eyes become visible around day 6.
6. Catch larvae at hatch. Hatching happens 1-2 hours after lights-out on day 7-11. Use a light over a separate 5-gallon larval tank; turn off display lights, and larvae swim toward the larval tank light.
7. Larval rearing. Feed rotifers (live Brachionus plicatilis) at 5-10 per ml for the first 7 days. Transition to baby brine shrimp (newly-hatched Artemia) day 7-10. Add greenwater (Nannochloropsis) to the larval tank for nutritional uplift.
8. Metamorphosis. Day 14-25 the larvae sink to the bottom and develop adult coloration over 2-3 days. They are now juvenile clownfish and can be grown out on crushed pellets.
9. Sell or rear. At 0.75 inch (45-60 days post-hatch) juveniles are saleable. Fast Aquatics accepts vendor applications from captive breeders.

Breeding difficulty by species

• Easiest. Ocellaris, Percula (12-18 months to first spawn, hardy fry)
• Moderate. Tomato, Skunk, Saddleback (18-24 months, slightly more sensitive fry)
• Difficult. Maroon, Clarkii (24+ months, aggressive pair formation, low yield per spawn)
• Very difficult. Latezonatus, McCulloch's, Mauritian (rare in captivity, low spawn frequency)

Which diseases affect clownfish?

The four diseases that cause most clownfish deaths are marine ich (Cryptocaryon irritans), marine velvet (Amyloodinium ocellatum), Brooklynella (Brooklynella hostilis - the "clownfish disease"), and bacterial infections (Uronema, Vibrio). Brooklynella is particularly dangerous because it specifically targets clownfish and progresses faster than ich or velvet. Quarantine every new fish for 30 days in a separate system, and the majority of disease problems disappear.

Brooklynella ("clownfish disease")

Symptoms. Heavy white slimy mucus on the body, breathing difficulty, gasping at the surface, refusal to eat. Progresses to death within 24-72 hours of first symptoms.

Treatment. Formalin bath at 150-200 ppm for 30-45 minutes daily for 3 days, in a separate hospital tank. Acriflavine is an alternative for milder cases. Lower the salinity to 1.018 during treatment to ease osmotic stress.

Prevention. Quarantine every new clownfish for 30 days. Brooklynella often hides during the first 14 days and emerges under stress.

Marine ich (Cryptocaryon irritans)

Symptoms. White salt-grain spots on body, fins, and gills. Scratching against rock. Rapid gill movement.

Treatment. Copper sulfate (Cupramine) at 0.5 ppm for 14-21 days in a separate hospital tank. Test copper levels daily with a Hanna HI713 checker - too much copper kills clownfish, too little is ineffective. Alternatively, the Tank Transfer Method: move fish to a fresh, ich-free tank every 72 hours for 16 days while the parasite cysts die off in the original tank.

Prevention. Quarantine 30 days. Never combine fish from different sources without separate quarantine.

Marine velvet (Amyloodinium ocellatum)

Symptoms. Fine gold/dusty sheen on body, severe respiratory distress, sudden mass die-off (can kill all fish within 48 hours).

Treatment. Chloroquine phosphate at 60 mg/L for 30 days in a separate hospital tank. Copper at 0.5 ppm for 21 days as alternative. Velvet progresses faster than ich, so begin treatment within 24 hours of recognizing the dusty sheen.

Prevention. Quarantine 30 days with prophylactic copper or tank-transfer method.

Bacterial infections (Uronema, Vibrio, fin rot)

Symptoms. Red sores, eroded fins, cloudy eyes, lethargy, hanging at the surface.

Treatment. Kanamycin sulfate or furan-2 (Furan-2) in a hospital tank for 7-10 days. Severe cases need injectable antibiotics from a fish vet. Improve water quality - bacterial infections are almost always secondary to high nitrate or low oxygen.

Prevention. Stable water parameters, low nitrate, regular water changes, no overcrowding.

How long do clownfish live?

Captive-bred clownfish in well-maintained tanks live 6 to 12 years on average, with confirmed records of 20+ years for Ocellaris in stable systems. Wild-caught clownfish typically live 3 to 6 years post-transfer because of capture stress, parasite load, and the difficulty of adapting wild-feeding fish to captive diets. Maroon and Clarkii live the longest of the common species (often 15+ years). Designer strains live the same as wild-type Ocellaris when the genetics are stable.

Lifespan by source

• Captive-bred from ORA / Sea and Reef / Biota. 8-12 years typical, 20+ years possible.
• Captive-bred from unknown small breeder. 6-10 years typical. Higher variance from inbreeding in small breeding programs.
• Wild-caught from sustainable collector. 5-8 years typical with excellent quarantine and acclimation.
• Wild-caught from cyanide-collected source. 6 months to 2 years typical. Cyanide damages liver and nervous system irreversibly.

This is the strongest argument for buying captive-bred: identical retail price, often half the price of wild-caught for designer strains, dramatically longer lifespan, no welfare concerns about reef collection.

How much do clownfish cost?

A wild-type captive-bred Ocellaris or Percula costs 15 to 40 dollars from a vetted vendor. Designer strains (Snowflake, Black Ice, Mocha Storm, Wyoming White, Davinci, Picasso) run 30 to 200 dollars per fish depending on pattern grade. High-grade Picasso Percula or named Maroon strains (Lightning Maroon, Gold Stripe Maroon) reach 400 to 800 dollars. Wild-caught species like Allard's, McCulloch's, or Mauritian Clownfish run 80 to 350 dollars when available.

2026 pricing reference

What is the difference between designer and wild-type clownfish?

Designer clownfish are captive-bred selected lines that express patterns not found in nature - extended white bars, solid orange faces, black-mocha bodies, leopard spots, missing bars. They were created in the 1990s by Sea and Reef Aquaculture, ORA, and a small number of independent breeders. Wild-type clownfish display the natural three-white-bar pattern. Designer strains have identical care requirements to wild-type but breed less true (offspring show variable patterns) and can show higher fry mortality from inbreeding in some lines.

The major designer strain families

• Snowflake / Extended White. White pattern extends beyond standard bars. Originated wild-caught in the Philippines 1990s, stabilized by Sea and Reef.
• Black Ice / Storm. Black or mocha base color with white pattern. Mocha Storm is a Mocha base with Storm-style white peppering.
• Wyoming White. Solid white body, orange face. C-Quest origin.
• Picasso. Connected and asymmetric white bars. Percula species only. Grade A (highest pattern coverage) commands premium price.
• Davinci. Connected bar pattern, often with vertical extension.
• Onyx Percula. Solid black flanks with orange face. Adult color develops at 18-24 months.
• Naked Ocellaris. Solid orange with no white bars at all - the "pattern is no pattern".
• Lightning Maroon. Maroon species with lightning-bolt scribble pattern. Originated from a single wild specimen from Papua New Guinea, captive-bred since 2008.

For a fuller designer-strain reference with pattern fixedness and breeder lineage, see our designer clownfish buyer guide covering all 18 commercially available strains.

How to acclimate a new clownfish

Drip-acclimate the new fish over 60 to 90 minutes. Float the bag for 15 minutes to match temperature, then transfer the fish and bag water to a clean container, set up a 2-3 drops-per-second siphon from the display sump or quarantine tank into the container until the bag-water volume has tripled. Test salinity at the end; if within 0.001 SG of the destination, net the fish out and discard the shipping water. Never pour shipping water into your tank.

Acclimation protocol step-by-step

1. Float the bag in the destination tank water for 15 minutes to equalize temperature.
2. Transfer to acclimation container. A small bucket or breeder net works. Pour the fish and shipping water into the container.
3. Start the drip line. Airline tubing with a knot tied for adjustment. Tie off until 2-3 drops per second exit the line. Source: destination tank water (quarantine ideally, display only if you skip quarantine, which you should not).
4. Drip 60-90 minutes. The shipping water volume should triple. Measure salinity halfway and at the end.
5. Verify salinity match. Refractometer test on the container water vs the destination tank. If within 0.001 SG, proceed. If not, drip another 30 minutes.
6. Net transfer. Use a soft fine-mesh net to lift the fish from the container into the tank. Never pour the container contents into the tank - you'd introduce shipping water plus any pathogens.
7. Lights off for 4 hours. The fish needs to find a refuge and lower its stress response. Resist feeding for 12-24 hours.

Common clownfish mistakes

1. Skipping quarantine. The single most common cause of mass die-off. Every new fish must spend 30 days in a separate hospital tank with prophylactic copper or tank-transfer method.
2. Adding a second clownfish to an established adult. The resident female will kill the newcomer in 24-48 hours. Always buy juveniles in pairs simultaneously.
3. Buying wild-caught when captive-bred is available. Wild-caught fish have shorter lifespan, higher disease risk, and welfare concerns. The price is similar or higher for inferior outcomes.
4. Pairing two different clownfish species. They will fight. One species per tank.
5. Treating with copper while corals or anemones are present. Copper kills invertebrates. All treatment must happen in a separate hospital tank.
6. Using a hydrometer instead of a refractometer. Hydrometers drift 5-10 percent and you can wreck your salinity without realizing it.
7. Buying an anemone before the tank is mature. Anemones need at least 6 months of stable parameters. A new tank kills anemones within weeks.
8. Feeding once a day to "avoid overfeeding". Clownfish need 2-3 feedings per day. Once-daily feeding stunts growth and breeds aggression around the single feeding event.