Clarkii Clownfish Clarkii Clownfish

Clarkii Clownfish – A Comprehensive Guide

Very well known and famous fish “Clarkii Clownfish” is a well-liked aquatic species. These are one of the larger species of clownfish and are identified for their toughness. These fish go thru a variety of names that essentially define their coloration or species recognition. Yellowtail Clownfish, Clark’s Anemonefish, Clark’s Clownfish, Clark’s Clownfish, Clark’s Clownfish, Clark’s Clownfish, Brown Anemonefish, Black Clown, Chocolate Clownfish, Sea bee, Sebae Anemonefish, and Two Banded Anemonefish are among them.

There have also been cultured a number of breathtaking types with vibrant white splodges on the fullbacks of the body.  It does have some peculiarities when it comes to breeders. Once they are born, all clownfish are indistinct, although they are sex splitters. This breed is unique in that it has two clowns who can either change to female or remain male. Individuals are really easy to care for, but because of their organic ability to swim further, they will require some more space, unlike many clowns. Such anemonefish are quite hardy. As they produce whistling or crackling sounds, anemonefish are frequently referred to as “singing” fish, with every subspecies having their unique vernacular. This species will thrive in either a reef or a fish-only aquarium. Although when harassed by other annoying clownfish, a pair will easily reproduce and stubbornly protect their eggs. Please read if you would like to gain knowledge something about “their unusual behaviour, tank upkeep, breeding, and anything else there is to know about Clarkii Clownfish

Background: In 1830, J.W.Bennett named the Clarkii Clownfish 

Scientific Name: Amphiprion clarkii

Family: Pomacentridae

Habitat/Range: These clownfish have wide coverage in the Indo-West Pacific Ocean, ranging from the Persian Gulf to Western Australia, then through Micronesia and the Ryukyu Islands, Southern Japan, Melanesia to Taiwan, and in the Western Pacific


Clark’s Clown is a Clarkii Complex clownfish with a massive body. These species have a twisted tail and a sturdy, rounder body, which allows them to swim quicker than anemonefish with rounded tails. As just an adult, the richly embroidered body can have a wide range of colours. Adults have 2 or 3 wide vertical whitish to grey stripes with a yellowish-brown basal colour. On such adults, the tail bands may be absent. A band is behind the eye, another is next to the anal feather, and the three are near the base of the tail section. The area around the mouth and nose is primarily white.

Males’ tail fins would be yellow, or at minimum have some yellow on them, whereas females’ tail fins may turn white as they age. Juveniles have two white body stripes and a reddish brown tint. They have a yellow nose and a yellow nose.

Clarkii Clownfish Size: 

These can grow to be as long as 5.5 inches (14 cm).

Clarkii Clownfish Color:

 Depending on where the clownfish is found, there are 8 various colour varieties. Like adults, they always have the same 2 vertical white stripes, however, colour variants can have different tail fin colours, ranging from pale yellow or a blend of the following. Below following are some of the most common color combinations: The subordinated clownfish responds to the hostile fish’s particular actions:

  • Its white throat, orange mouth, eyes, gills, chest and lateral fins, brown to black body, and white tail fin characterize the Indo-Pacific colour variant. The tail of this variant can be completely yellow or white with yellow borders.
  • The nose of the Japanese colour variation is practically purple in colour. Above the eye, including the head, it is black, while below the eye, such as the dorsal fins, gill, jaw, breast, and belly, it is yellow to orange. The anal fin and tail fin are yellow as well, and the entire body is black to brown in colour.
  • A completely black body with a white snout and white at the tip of the tail, as well as a white or pale yellow tail.
  • A dark body with a white nose, white at the bottom of the tail section, yellow tail section, and yellow ends on the dorsal fins.

Difference between males and females Clarkii Clownfish

Sexes are about the same size, however, they have varied colours. Male tail fins, for example, may be yellow or get some yellow on them in specific areas, but females tail fins can turn to white as they age.

Clarkii Clownfish Lifespan: 

14 years- On confinement, the Clark’s Clownfish has been known to live for 14 years. As in the wild, they have been known to live for up to 13 years.

Behavior and Temperament: 

The Clarkii Clownfish is among the most violent clownfish, being semi-aggressive. These can be maintained in either a coral or a fish-only aquarium. Anyone else clown fish couples will be targeted when an adult couple has mated. Since this anemone protects them, you can maintain them with a wider range of tank companions, even larger semi-aggressive fish.

Care level:

 The Clarkii Clownfish is a resilient and easy-to-care-for species of clownfish. They are excellent starter fish for aquarists.

Conversation Status: 

There is no danger of extinction of this species. The population-trend is a question. In the western Pacific Ocean, it is fairly common. Clark’s clownfish are frequently overused in the tank trade, and their natural environment is in places where dynamite-fishing is used. This anemonefish’s host sea-anemone could be subject to bleaching-episodes, opening them up to predators.

Aquarium Condition for Clarkii Clownfish

Image credit @

Tank Set up for Clarkii Clownfish

Tank size: 

30 gal (114 L) – For a fish-only tank, a minimum of 30 gallons is suggested, however, 40-50 gallons is preferable. If you want to maintain it with an anemone, you’ll need to have a bigger tank, like 55 gallons or over.

Suitable for Nano Tank: No

Tank Setup: 

The tank is filled with marine rocks or corals and they look beautiful but the reason is that black clownfish are compatible with corals.

Tank Lightening:

 Until you have an anemone, lightning isn’t a problem. If you’re trying to house it with a sea-anemone, it’ll be difficult. Anemone requires an intense lightning system. 

Live Rock Requirement:

 Yes, this is for hiding areas. When there are no anemones around, rock-structures with sufficient hiding-spaces are essential.

Substrate Type: Any

Maintenance of the tank: 

Daily: Do check the water-filter, water-temperature, specific-gravity, and all the other equipment placed in the tank.

Weekly: Do check water-quality one time a week necessarily.

Monthly: Change up to ten to twenty-five percent as per the total-volume of water every 2-4 weeks/when required. Gradual placement of new mates in the tank is also significant.

  • Equipments and Tank setting

Clarkii Clownfish is a large, energetic clownfish. For a single specimen, a minimum tank size of 30 (114 L) gallons is required, while 40-50 gallons is preferable, and 55 gallons is required for a pair. Keep in mind that smaller tank sizes cause water quality to degrade more quickly, necessitating weekly water changes of 5%. Despite their tolerance for less-than-ideal water quality, any saltwater fish exposed to it for an extended period of time will succumb to sickness.

If there isn’t an anemone, add some live rocks and create some hiding spots. The swift flow of water will make it very difficult for them to move, so if you have a fish in the tank that requires it, place it near the back of the tank to keep your clownfish from being blown away. Once it has become used to its surroundings, it is a daring fish that will swim to the top to eat.

Because this species is native to the tropics, tank sea surface temperatures between 72°F and 82°F (22°C- 28°C), and a pH range of 7.8 to 8.4. Extremes of temperature exceeding 90° F (32° C) or below 64° F (18° C) would be too much for them. The ideal temperature for spawning is between 79°F and 83°F (26°C- 28°C).

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While you’re keeping them with an anemone, the aquarium should be large enough to accommodate the anemone’s requirements. With an anemone, appropriate lighting is required, and the tank should be well developed, i.e. 6 months to a year old. They will spend the bulk of their time with a host, but they will also swim throughout the aquarium so that they will want some open swimming space.

List of equipments that are required for a saltwater aquarium:

  1. Ground Fault Circuit Interrupter (GFCI)
  2. Power strip/surge protector
  3. Tank
  4. Tank stand
  5. Bio-Wheel Filters
  6. Reverse Osmosis Unit or Deionizer 
  7. Salt mix 
  8. Hydrometer
  9. Digital pH Monitor
  10. Aquarium Photo Background or Paint the background
  11. Test kits
  12.  Buckets, Towels, Rubber Gloves
  13. Substrate
  14. Refugium
  15. Trace Elements
  16. Aquarium vacuum
  17. Live Rock / Decorative rocks or coral 
  18. Heater
  19. Thermometer
  20. Saltwater test kit
  21. UV Aquarium Sterilizers
  22. Lights 
  23. Powerhead and sweeper
  24. Protein Skimmer 
  25. Salinity Meter
  26. Reverse Osmosis System (RO/DI Unit)
  27. Wave Maker and Power Head
  28. Algae Scraper
  29. Media Reactor
  30. Carbon and GFO
  31. Marine Fish

Yellowtail Clownfish Water Parameters

There are some important water-parameters for Yellowtail Clownfish given below:

ParameterSuggested Level FOSuggested Level FOWLRSuggested Level Reef
Specific Gravity1.020-1.0251.020-1.0251.023-1.025
Alkalinity8-12 dKH8-12 dKH8-12 dKH
Ammonia (NH3)UndetectableUndetectableUndetectable
Nitrite (NO2)UndetectableUndetectableUndetectable
Nitrate – Nitrogen (NO3)< 30.0 ppm< 30.0 ppm< 1.0 ppm
Phosphate (PO4)< 1.0 ppm< 1.0 ppm< 0.2 ppm
Calcium350-450 ppm350-450 ppm350-450 ppm
Magnesium1150-1350 ppm1150-1350 ppm1250-1350 ppm
Iodine0.04-0.10 ppm0.04-0.10 ppm0.06-0.10 ppm
Strontium4-10 ppm4-10 ppm8-14 ppm

Breeding Temperature: 

Temperature of 79° F to 83° F (26° – 28°C) produces the greatest quality eggs and larvae.

Brackish: No

Water Movement: 

Either – Feeding spots should be in regions of the tank where the water is calmer.

Water Region:

 Overall – When housed with an anemone, individuals would spend the majority of their time with that as well, although they will occasionally swim around the tank.

Water Hardness: 18 dGH

As per my knowledge, these are ideal parameters; though, fire clowns could endure minor discrepancies and less-than-ideal situations.

Cost: $10-$15

Compatibility: Community safe

Aquarium Hardiness: Very Hardy

Prone to Disease: No

Clark’s Clownfish Anemonefish Feeding Guide


 flaked food, Frozen food, and live foods.


 Clark’s Clownfish are omnivores, meaning they eat everything. They eat zooplankton, polychaete worms, small shrimp, benthic algae and weeds, amphipods, and other organisms in the environment. These fish eat both plants and animals (omnivores). In the absence of algae, you have to use items that include Spirulina.

Flake Food: Yes

Pellet/Tablet: Yes

Live foods (shrimp, fish or worms): 

Including a variety of live foods in their diet is not needed, but it may assist them to prepare for spawning. Pre-breeding training and live specimens will benefit from live meals. You could give them extremely small feeders-shrimp with a lot of nutrients in their guts.

Vegetable Food: 1/2 of their diet

Meaty Food: 1/2 of their diet

Feeding Frequency: 

Adults should be fed twice a day, and youngsters should be fed three to four times a day. They have a normal metabolic system and should be fed twice a day. If you have a pair of Clark’s Clownfish in the reproductive stage, increase the feed three times every day.

Two Banded Anemonefish tank mates

Compatible Other Fish:

These Clark’s Clown must not be kept alongside similar clownfish species since they are aggressive towards them. Clownfish made between 2 and 17 clicks in a row while still being attacked or attacking. Diving and even fishkeepers will occasionally hear (aimed at larger fish) and “pops” (aimed at smaller fish) from them. When they are mating, they are actually deafeningly quiet. Pop is heard in pairs or one at a time, just before a chirp sounds, thus they could be having two separate talks! “Get out of here, Angelfish!” and “Get in line, you inferior!”

They make the sound using their jaws, and the jaws act as an amplification, therefore the sounds will vary from species to species, much like a dialect or accents. There are 29 clownfish that make detectable sounds, some of which are stronger than in others. Clark’s Clownfish, Tomato Clownfish, and Pink Skunk Clownfish are among the loudest three.

The differences in behaviour among clownfish of the same species are fascinating and easy to spot. A female’s continuous dominance precludes a male from changing sex. A dominant clownfish will exhibit “agonistic conduct,” whereas the submissive clownfish will exhibit “appeaser behaviour.”

The subordinate clownfish responds to the hostile fish’s particular actions:

  • Whether the belligerent fish, usually a female, is following and tweeting, the submissive clownfish, that might be a male/a sub-adult, would quickly shake their body and make clicking noises when they glide upward. The aggressive clown fish’s jaw snapping causes the subordinate clownfish to shake their body or head.
  • The violent clown fish’s jaw snapping causes the submissive fish to shake their head/body.
  • The hostile clownfish lean ventral causes the submissive clownfish to tremble.
  • When a violent clown fish exhibits pectoral leaning, the subservient clown fish exhibits ventral-leaning.

A list of compatible tank mates for Yellowtail Clown are given below:

Peaceful fish: 

(But need to monitor, when place in a mini-tank) 

  • Gobies
  • Dartfish
  • Assessors 
  • Fairy wrasses


  • Anthias 
  • Clownfish 
  • Dwarf angels

Aggressive: (But need to monitor and place in a big aquarium)

  • Dottybacks 
  • 6-Line & 8-Line 
  • Wrasse Damselfish

Large Semi-Aggressive: 

  • Tangs 
  • Large Angels 
  • Large Wrasses

Large Aggressive: (But need to monitor)

  • Lionfish 
  • Groupers
  • Soapfish

Shrimps, Crabs, Snails: (But need to monitor because Clarkii Clown might eat them)


  • Starfish
  • Feather Dusters
  • Bristle Worms
  • Flatworms
  • Clams, Scallops 
  • Oysters
  • Copepods
  • Amphipods 
  • Mini Brittle Stars

Non-compatible tank mates: These could be the worst tank-mates with clarkii clownfish:

Slow Swimmers & Eaters: 

  • Seahorses
  • Pipefish 
  • Mandarins


  • Triggerfish
  • Eels
  • Batfish
  • Some Puffers
  • Sharks/Rays
  • Wrasse-fish only

 Only keep one type of clown in your tank. Mixing clown species is not a good idea.

Symbiotic Relationship with Sea-anemones: 

A symbiotic interaction between a clownfish and a sea anemone is known as symbiosis, and it occurs when they assist each other. In the environment, clownfish stick with specific anemones to defend themselves from anemone-eating fish. In exchange, the anemone shields the clownfish from attackers by using its stinging tentacles to keep them at bay. Clownfish grow immune to the anemone’s tentacles’ sting. An advantage is that the clownfish can eat the leftovers of any meal that the anemone has grabbed. The clownfish will also clean up after themselves by eliminating bits of trash from the bottom. The coral is also supposed to be fed by the clownfish’s excrement.

This species has been observed with a total of ten different sea anemones. The following are types of host anemones:

  1. Cryptodendrum adhaesivum (Adhesive Sea Anemone)
  2. Entacmaea quadricolor (Bubble Tip Anemone)
  3. Heteractis aurora (Beaded Sea Anemone)
  4. Heteractis crispa (Leathery/Sebae Anemone)
  5. Heteractis magnifica (Magnificent Sea Anemone/Ritteri Anemone)
  6. Heteractis malu (Delicate Sea Anemone)
  7. Macrodactyla doreensis (Long Tentacle Anemone)
  8. Stichodactyla gigantea (Giant Carpet Anemone)
  9. Stichodactyla haddoni (Saddle Anemone)
  10. Stichodactyla mertensii (Merten’s Carpet Anemone)
  11. Heteractis malu (Sebae Sea Anemone)

Condy Anemones (Condylactis gigantea) should be added with care. These are carnivorous anemones with high mobility. They are not “clown hosting anemones.” Their sting is far greater than that of clownfish-hosting anemones, and any clownfish dumb enough to engage it risks being eaten. One day the clownfish was gone, and I maintained the anemone well nourished!Many people who have had clownfish housed by Condylactis have claimed.

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Reef Compatible: 

Clownfish are at home in a reef environment, especially when paired with a host anemone. Clownfish rarely harm corals, with the exception of picking algae from the base of a coral they’ve taken up as a host. Your clown will have a rich realistic environment thanks to a host anemone. Whereas most fish avoid the anemone’s stinging tentacles for fear of becoming food, your clown fish will spend the majority of its time inside it. Sea anemones are a beautiful addition to any reef aquarium, but they are more difficult to maintain. When you decide to retain an anemone, ensure its unique requirements are addressed.

The Clark’s Clownfish will survive without an anemone. This species of clownfish has been observed to switch hosts. Surrogate hosts could be soft corals or large polyped stony corals (LPS) from the Euphillia family. Surrogate hosts like hairy mushroom reefs are also popular. With any host that isn’t an anemone. Surrogate hosts like hairy mushroom corals are also popular. If you’re using a non-anemone host, make absolutely sure the Clark’s Clownfish isn’t bothering any of these reefs to the extent that they won’t open, or they’ll die of starvation.

Substitute hosts have also been reported, including:

  • Large polyped stony corals (LPS) 
  • Filamentous Algae
  • Xenia Corals
  • Corallimorphs, Mushroom Anemones 
  • Zoanthids (Button Polyps, Sea Mats)
  • SPS corals (Small polyp stony corals) – May adopt some species of soft coral as a host 
  • Gorgonians, Sea Fans
  • Leather Corals
  • Soft Corals (xenias, tree corals)
  • Star Polyps (Pachyclavularia violacea)
  • Organ Pipe Coral (Tubipora musica)

Amplexidiscus fenestrafer, often known as the Elephant Ear Mushroom or Giant Cup Mushroom, should be avoided. It’s been known to catch and eat immature clownfish, so keep an eye on it. Adults of a certain size may not be at risk. Invertebrates are unlikely to be harmed by Clark’s Clownfish unless they are non-cleaning shrimp including Pistol Shrimps, Marbled Shrimps, Sexy Shrimps, and so on. The Clark’s Clownfish will occasionally purposefully knock or drag these shrimp inside the host anemone!

Predator Tank Compatible: No

Number to a tank:

 You can keep them alone or in pairs, but it’s best if you just place one pair at a time. Because they may get aggressive if there are more couples.

How to Breed Clark’s Anemonefish?

Step 1:

Although the Clarkii Clownfish has been grown in captivity, this species has some uncommon breeding characteristics for clownfish. Although they establish partnerships in the same way as other clownfish, they are noteworthy for not being “loyal.” If males and females are in close proximity, males will mate with other females and females will pair with other males. This species also has peculiarities, such as a pair of two clowns who may either turn male or remain female. In addition, rather than a regular coupling, a group of three youngsters raised together may potentially breed in a three-way: one overworked male with two females.

Step 2:

If you want to hurry things up, make sure they’re getting a nutritionally-balanced and calorie-balanced diet. Most appropriately you should have to make sure to provide them a calorie and nutrients balanced food many times a day. Live-foods are typically more healthful than canned-foods.

Step 3:

The Clarkii clownfish is not the easiest of the clownfish species to breed, but with persistence & care, you should be able to achieve it. Fish grown in tanks are easier to reproduce than those collected in the open. 

Step 4:

While Clark’s  clownfish can change sex, they are born genderless. They turn into adolescent males in response to specific social cues, and when the time comes, a dominant transforms into a female. On the other hand, each of these clownfish has a different personality. Anemonefish have been observed to stray further from their host-anemone than others. 


 It is extremely difficult to pair clownfish, and if a female refuses to accept a potential male, the relationship will end with that male’s death. It’s sufficient to nurture a group of juveniles and let them pair up on their own. It is better to segregate the pairing-couple from the rest of the tank. It is possible that you will maintain both the female and male in the same aquarium and they will not tolerate each other. For that male, it becomes dangerous.

After the matching has been completed, it is a terrific idea to nourish the couple with plenty of high-quality, fresh food. It’s even easier because you don’t need a sea-anemone to spawn. These fish are substrate-breeders and prefer to lay their eggs in a solid surface or cave, such as an upturned clay pot.

Pre-spawning Behavior: 

Clark’s Anemonefish have been observed drifting further away from their host anemone than other clownfish. Males in the wild are infamous for abandoning their mates, kicking out a lesser male in a nearby anemone, and capturing his female, who then repeats the process with the next smaller fish.

Depending on the couple, clownfish acts during romancing include angling away from each other with their abdomen surfaces close together, angling towards each other with their dorsal surfaces close together, thrashing their heads, or one or both participating in head standing. Clownfish do not breed for the whole of their lives and will stop breeding several years before they reach the end of their life expectancy.

Spawning Process: 

These clowns spawn all year in tropical waters with temperatures ranging from 72 to 88 degrees Fahrenheit (26 to 28 degrees Celsius). The best quality eggs and larvae are produced when the temperatures are between 79° and 83° F (26° and 28° C). Spawning occurs from the middle of May to October in seas where the water temperature is 79° F or greater throughout the winter months, such as southern Japan. In hotter temperatures, they spawn 2 to 3 times per month.

Once the couple has chosen a spawning place, they will clean it well to ensure proper egg adhesion. The area is usually near to the anemone, which protects its tentacles by its presence. If the eggs are near the tentacles just before spawning, the clownfish pair will pick at the anemone to cause it to withdraw, exposing the entire spawning spot. The female puts her belly against the surface, quivers, and drags herself slowly down the surface, leaving a trail of crimson eggs behind her, and will do so in a circular pattern until all of her eggs have been laid. After that, the male will approach her and fertilise the eggs.

The eggs will hatch 1 to 1.5 hours after sunset in 8 to 10 days, depending on water temperature. They metamorphose into post-larval fish on the eighth day after hatching. Then they begin to resemble miniature copies of their parents. belly against the surface, quivers, and drags herself slowly down the surface, leaving a trail of crimson eggs behind her, and will do so in a circular pattern until all of her eggs have been laid. After that, the male will approach her and fertilise the eggs.

Protection of their eggs:

 Spawning takes place two to three hours after the sun sets for the day and lasts about one and half hours, with a clutch of eggs ranging from (435 to 981) eggs on average, with an average of four hundred and forty eggs depending on the size of the female. The bright red eggs are fanned and mouthed to keep them clear of fungal infections and debris while they develop, as well as to keep them well oxygenated. 

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The eggs will hatch one to one and half hours after sunset in eight to ten days, depending on water temperature. They transform into post-larval fish on the eighth day after hatching. Then they begin to resemble miniature copies of their parents.

Ease of Breeding: Moderate


It’s a good idea to acclimate Clark’s Clown in a deep bucket so that they don’t tumble out. Take the following steps:

  • Fill a large bucket halfway with water and place your clownfish inside
  • Drizzle-acclimate for 45 minutes at a rate of three drips per second. During this time, your fish adjusts to the tank’s water parameters.
  • When the fish has completed the acclimatisation process, gently place it in the tank with the help of a fish-net.
  • Keep in mind that you don’t have to fill the tank with water from your fish’s home.

How do you keep Clark’s  Anemonefish with care?

Clark’s Clown is super strong and easy to keep. As a first attempt in the saltwater hobby, beginner aquarists will find success with the Clarkii Clownfish. Regardless of how “bulletproof” they are, poor water quality will still cause illness and disease. Your anemonefish will have a long life if you do normal water changes, give them a variety of foods, and keep them in the right tank with the right tank mates.

In nature, these clownfish associate with anemones, but in the tank, they are perfectly content without one. These clowns are just as content to take shelter amid the rockwork. If you’re going to try an anemone, wait at least 6 months before adding this clownfish to develop experience evaluating and adding calcium, magnesium, and other nutrients to your tank. They will adore their Bubble Tip Anemone, but if there are any other tankmates around, they will get violent.

Clark’s clown is hardy and quite easy to look for. When given good water conditions and a well-maintained tank, they thrive. Despite their tolerance for less-than-ideal water quality, any saltwater fish exposed to it for an extended period of time will succumb to illness and disease. Regular bi-weekly water changes will also aid in the replacement of trace elements lost by the fish and corals.

  • What could you do to keep your Clownfish from getting sick?

When given good water conditions and a well-maintained tank, they thrive. Despite their tolerance for less-than-ideal water quality, any saltwater fish exposed to it for an extended period of time will succumb to illness and disease. Regular bi-weekly water changes will also aid in the replacement of trace elements lost by the fish and corals.

Be careful if you notice the following symptoms:

  • Anorexia 
  • Strenuous breathing
  • White-spots on the body
  • Open-sores
  • Bulging eyes
  • Cloudy-eyes
  • Reddish fins 
  • Frayed and ripped fins

Anorexia is frequently the first indicator. If your Clownfish refuses to eat something, explore the signs of other ailments earlier to start treatment. The other indicators are self-evident and will reveal whether Clark’s clownfish got sick. Diseases can be introduced to your tank via live rock, corals, and fish that have not been adequately cleaned or quarantined. The easiest way to avoid this is to make sure that whatever you want to add to the tank is thoroughly cleaned or quarantined. Other measures to prevent sickness include providing high-quality diets, clean, high-quality water, and appropriate tank mates.

Somewhat than subjecting the fish to the arduous work of being exposed to medication and distress, it is preferable to keep an eye on the symptoms.

  • Diseases

These fish are often fairly tough; therefore, the disease is rarely an issue in a well-kept tank. But, if they do become ill, though, some conditions can be fatal. Clownfish are subject to similar diseases and conditions that other saltwater fish are, such as fungal, bacterial, parasitic, and other disorders. When excellent water purity is not ensured, the temperature varies excessively, or the fish is agitated resulting from poor tank-mates, all marine fish would become unwell. A disturbed fish seems to be more vulnerable to illness.

Be careful if you noticed the following Disease:

  • Brooklynellosis, often known as Clownfish-Disease/Brooklynella hostilis (Brook)
  • Marine Ich/Cryptocaryon irritans/Velvet Disease/White Spot Disease Crypt
  • Uronema (Uronema marinum)
  • Oodinium ocellatum (Synonyms: Amyloodinium ocellatum, Branchiophilus maris)

These are mostly parasitic infections.

  • Treatments

Crypt (saltwater Ich) is the easiest to treat, but they’re all manageable if found early enough. Marine Velvet is a parasitic skin flagellate that is one of the brownest clowns problems in marine aquariums. It is a fast-moving pathogen that attacks the gills principally. Brook kills in 30 hours, but Uronema is one of the fastest killers, killing in as little as 24 hours. Uronema is commonly contracted when an aquarist reduces salinity to treat another ailment but does not go far enough. This parasite grows in brackish water with a specific gravity of 1.013 to 1.020, which is ideal for it. If you have an ailment, make sure to cure it at a regular salinity of approximately 1.023 or a lower salinity of around 1.009. 

For both salinity-ranges, Rapid Treatment and other thirty-seven percent Formaldehyde solution preparations will perform properly, however, the lesser 1.009 will aid with the oxygen concentration. As the salt level decreases, the proportion of oxygen in the water increases. “I discovered that when I used the right hyposalinity of 1.009, no greater when fighting Brook or Crypt, my clownfish seemed to breathe better and would be less worried”… Carrie McBirney.

Diseases can be introduced to your tank via live rock, corals, and fish that have not been adequately cleaned or quarantined. The easiest way to avoid this is to make sure that whatever you want to add to the tank is thoroughly cleaned or quarantined. Other measures to prevent sickness include providing high-quality diets, clean, high-quality water, and appropriate tank mates.

FAQs Related to clarkii clownfish

What is the appearance of a clarkii clownfish?

The face or nose area is usually white. Male’s tail fins will be yellow or will at least have some yellow on their tail fin, but some female’s tail fins can change to white as they mature. Juveniles are a cinnamon brown color with a yellow nose and two white body bands.

Is the clarkii clown hostile?

They are semi-aggressive in behavior. But, as they grow older, they could become territorial and violent. It might be calm, but it will become aggressive if some other fish enters its area.

What is the maximum size of a clarkii clownfish?

The length of Clark’s Clown is around 5.5 inches (14 cm)

What do Clarkii clowns eat?

The Clark’s Clownfish are omnivores. In the wild, they feed on zooplankton, benthic algae and weeds, small shrimp, amphipods, polychaete worms, and more. In the aquarium, they will eat a wide variety of live, frozen, and flake foods. They will also consume naturally growing algae in the tank.


Overall, we can declare that keeping clarkii clownfish at home is an easy effort for beginners. The tank set up, water parameters, and equipment is all simple to keep clean and maintain. It is imperative that you educate yourself first, as feeding Clark’s Clown is not an easy chore. Your Seabee will suffer health problems if you don’t know how much and how often they should be fed. Tank mates should be chosen carefully so that your Yellowtail Clownfish does not become a victim of other fish or grow aggressive enough to harm the tank’s environment. Chocolate Clownfish can live as long as they can in captivity if they are properly cared for. 

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