A massive, nocturnal predator native to Southeast Asia, widely known for the distinct row of ocellated spots above its anal fin. While sold as small silvery cute juveniles, they grow incredibly fast into nearly 1-meter giants that require immense aquariums. They are obligate carnivores and will eat any fish small enough to fit in their large mouths. They are shy during the day and require large hiding tubes or caves.
At a Glance
Tank Requirements
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Water Parameters
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Temperament & Compatibility
Available Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Standard (Adult)
The fully grown adult form. Requires a tank with a footprint wide enough for it to turn around (at least 75cm width recommended). Highly territorial towards other Knifefish.
Differs in 1 trait from base species
Also known as: Adult, Monster Fish
Juvenile (Grow-out)
Commonly sold size (10-15cm). Deceptively peaceful and shy. WARNING: Grows extremely fast. Will eat neon tetras and guppies immediately. Requires an upgrade plan to a 200G+ tank within 12-18 months.
Differs in 5 traits from base species
Also known as: Baby, Small
Albino / Golden
A color morph lacking the dark grey pigmentation. Care requirements are identical to the standard form.
Differs in 1 trait from base species
Also known as: Platinum, Gold
Clown Knifefish Care Guide Summary
The Clown Knifefish, scientifically known as Chitala ornata, belongs to the Oddballs family group. Adults reach a maximum size of approximately 90 cm and have a compressed body shape with a fast growth rate. Classified as aggressive, this species primarily occupies the mid-level and bottom zones of the aquarium and produces a extreme level of biological waste.
To thrive, the Clown Knifefish requires a freshwater only aquarium with a minimum volume of 750 litres and a tank length of at least 180 cm. Water temperature should be maintained between 24°C and 28°C, with a pH range of 6–7.5 and a general hardness of 5–15 dGH. A moderate water flow is preferred. An aquarium test kit can help you monitor these values.
Due to its specialist needs, the Clown Knifefish is best suited for fishkeepers who can provide a carefully planned setup. This species is available in 3 varieties: Standard (Adult), Juvenile (Grow-out), and Albino / Golden. Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.
Clown Knifefish Habitat Setup
When setting up an aquarium for the Clown Knifefish, a moderate water flow best suits their natural preferences. Because this species occupies the mid-level and bottom zones, the aquarium layout should prioritise open swimming space in the centre of the tank for free movement and sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include smooth gravel or rounded substrate to protect their sensitive barbels, driftwood, which can serve as both a hiding place and a dietary supplement, and dense planting to provide cover, break sightlines, and reduce stress. Keepers should note that a tight-fitting lid is essential, as this species is a known jumper. Browse smooth aquarium gravel options to find the best fit.
Clown Knifefish Compatibility Notes
Classified as aggressive, the Clown Knifefish is best housed alone, as they do not tolerate others of their kind in confined spaces. When choosing tankmates, any fish small enough to fit in its mouth will likely be eaten, conspecific aggression can be intense, especially in smaller tanks, and boisterous or fast-moving tankmates may cause this species undue stress. Selecting tankmates that favour different water layers from the mid-level and bottom zones can help reduce competition and territorial overlap.
Clown Knifefish Feeding & Diet Considerations
The Clown Knifefish is a predatory species that will readily consume small fish, so nano or bite-sized tankmates should be avoided and is primarily active at dusk and dawn, so offering food shortly after lights-off ensures it receives adequate nutrition. Find quality Clown Knifefish fish food for this species.
Frequently Asked Questions About Clown Knifefish
How big does Clown Knifefish get?
Clown Knifefish (Chitala ornata) typically reaches a maximum adult size of approximately 90 cm. They have a compressed body shape and a fast growth rate.
What tank size does Clown Knifefish need?
A minimum aquarium volume of 750 litres and a tank length of at least 180 cm are recommended for Clown Knifefish. This ensures enough swimming space and helps maintain stable water conditions.
What water parameters does Clown Knifefish need?
Clown Knifefish thrives in freshwater only conditions with a temperature range of 24–28°C, a pH between 6 and 7.5, and a general hardness of 5–15 dGH. A moderate water flow is preferred.
Is Clown Knifefish peaceful or aggressive?
Clown Knifefish is classified as aggressive with an aggression score of 7 out of 10. Careful tankmate selection is essential to avoid conflict.
Can Clown Knifefish live with others of its kind?
No. Only one Clown Knifefish should be kept per tank. Keeping multiples in the same aquarium typically results in aggression and stress.
Does Clown Knifefish have any special tank requirements?
Yes. Clown Knifefish benefits from smooth gravel (sensitive barbels), driftwood (digestion/hiding), and plants - densely covered in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.
Does Clown Knifefish need a lid on the tank?
Yes. Clown Knifefish is a known jumper, and a tight-fitting lid or cover is essential to prevent escape. Even a small gap can be enough for a determined fish to leap out.
Similar Species
Black Ghost Knifefish
Apteronotus albifrons
A fascinating nocturnal predator native to the Amazon basin. It lacks a dorsal fin and moves via a continuous undulating ventral fin, allowing it to swim backwards as easily as forwards. It generates a weak electrical field to navigate and hunt in the dark. Scaleless and highly sensitive to medications, it requires smooth hiding places (like PVC pipes or smooth driftwood). Will consume any fish small enough to fit in its surprisingly large mouth.
African Butterfly Fish
Pantodon buchholzi
A fascinating, prehistoric-looking surface dweller native to the slow-moving waters of West Africa. They are strictly top-dwelling ambush predators with a completely flat back and upturned mouth designed to hunt insects and small fish. A tight-fitting lid is absolutely mandatory as they are exceptional jumpers capable of gliding above the water.
Iridescent Shark
Pangasianodon hypophthalmus
The Iridescent Shark is not a true shark, but a highly active, schooling catfish native to Southeast Asia. While frequently sold as tiny juveniles, they are notorious 'tank busters' that grow to massive sizes. They are extremely skittish and easily spooked, often injuring themselves by crashing into aquarium glass. They are best suited for heated indoor ponds or massive custom aquariums.
Florida Flagfish
Jordanella floridae
A robust, deep-bodied killifish native to Florida. Unlike most killifish, they are primarily herbivores and are renowned for their ability to eat Hair Algae and sometimes Black Beard Algae. They are sub-tropical and thrive in unheated aquariums. They can be fin-nippers, especially if underfed or kept with long-finned tank mates.
Indonesian Datnoid (Tiger Fish)
Datnioides microlepis
A massive, deep-bodied ambush predator highly prized by monster fish keepers for its striking black and gold 'tiger' stripes. Native to the freshwater rivers of Southeast Asia, they possess huge mouths and will consume any fish small enough to fit. They are notoriously shy when young but grow into bold, impressive centerpieces. Due to intense conspecific aggression, they should be kept entirely solitary or in groups of 4 or more to disperse bullying.
Red-Tail Catfish
Phractocephalus hemioliopterus
A massive, fast-growing predatory catfish from the Amazon basin. Famous for its voracious appetite, bulldozer-like behavior, and distinct red caudal fin. Due to its enormous adult size (often exceeding 4 feet), it is strictly a 'monster fish' that requires a heated indoor pond or a colossal custom aquarium. It is highly predatory and will swallow absolutely any tank mate that can fit into its cavernous mouth.