A striking nano killifish resembling a tiny rocket. Native to West African swamps, they have distinct black and yellow vertical bands. They are strictly surface dwellers (top-level) and are non-annual, meaning they live longer than annual killifish (2-3+ years). They are notorious jumpers and require a tight lid.
At a Glance
Tank Requirements
Water Parameters
Temperament & Compatibility
Available Varieties
Each variety inherits the species defaults above. Only differences are highlighted.
Male
Larger and significantly more colorful. The tail fin resembles a rocket flame with vivid red, blue, and yellow stripes. Males will flare and spar but are rarely dangerous to one another.
Differs in 2 traits from base species
Female
Slightly smaller with clear/translucent fins and less distinct banding. Essential for reducing aggression in males (harem ratio recommended).
Differs in 3 traits from base species
Clown Killifish Care Summary
The Clown Killifish, scientifically known as Epiplatys annulatus, belongs to the Killifish family group. Adults reach a maximum size of approximately 3.5 cm and have a fusiform body shape with a moderate growth rate. Classified as peaceful, this species primarily occupies the surface zone of the aquarium and produces a low level of biological waste.
To thrive, the Clown Killifish requires a freshwater only aquarium with a minimum volume of 19 litres and a tank length of at least 30 cm. Water temperature should be maintained between 23°C and 27°C, with a pH range of 5–7 and a general hardness of 1–8 dGH. A low water flow is preferred. To replicate their natural habitat, the tank should include plants - floating, plants - densely covered, and leaf litter/blackwater.
This species should be kept in groups of at least 4 to reduce stress and encourage natural behaviour. Keepers should be aware that this species is a known jumper, so a tight-fitting lid is essential. This species is available in 2 varieties: Male and Female. 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.
Similar Species
Least Killifish (Heterandria)
Heterandria formosa
Despite its common name, the Least Killifish is actually one of the smallest livebearing fish in the world, belonging to the Poeciliidae family, not the killifish family. Native to the southeastern United States, they are incredibly peaceful and perfect for nano tanks. Unlike most livebearers, they exhibit 'superfoetation', meaning females drop 1-2 fry every few days rather than a large single brood.
Gardner's Killifish
Fundulopanchax gardneri
A stunning, semi-annual killifish native to Nigeria and Cameroon. Known for being relatively hardy and an excellent 'beginner' killifish. They are notorious jumpers and require a tightly fitting lid. While they can be kept in community tanks with similarly sized, fast-moving fish, males can be boisterous and territorial.
Golden Wonder Killifish
Aplocheilus lineatus
A large, incredibly hardy, surface-dwelling killifish. The 'Golden Wonder' is a selectively bred bright yellow morph of the wild Striped Panchax. They are notorious predators with surprisingly large, trapdoor-like mouths; they will easily consume neon tetras, guppies, and dwarf shrimp. They are completely peaceful with fish too large to eat, but require a tight-fitting lid as they are expert jumpers.
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.
Clown Knifefish
Chitala ornata
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.
Bumblebee Goby (Brackish)
Brachygobius xanthozonus
A miniature, bottom-dwelling goby famous for its striking black and yellow stripes. While they are often sold as freshwater fish and can survive in it temporarily, they are highly susceptible to fungal infections in fresh water and truly require a brackish setup (SG 1.002-1.005) to thrive long-term. They are notoriously picky eaters, often ignoring flakes in favor of live or frozen foods (like bloodworms or brine shrimp).