Clown Killifish Care Guide - Aquarium Setup, Diet & Breeding

Clown Killifish are tiny, striking surface-dwelling fish with a slender body, an upturned mouth and a distinctive banded pattern. Their dark vertical bars contrast with bright yellow, orange and blue markings, especially on mature males, while the tail often displays vivid red, yellow and blue edging.

They spend much of their time just beneath the water surface, where their small mouths and flattened upper profile are well suited to taking insects and other prey from the top. They are peaceful by nature, but males may display to one another by spreading their fins and performing brief, harmless chases.

In the wild, these killifish are associated with calm, shallow habitats shaded by overhanging vegetation. Their surroundings are often rich in floating plants, leaf litter and tangled stems, creating a broken, sheltered surface rather than open, brightly exposed water.

Clown Killifish are members of the Epiplatys group and are often chosen for planted nano aquariums because of their unusual appearance and surface-oriented behaviour. They are capable jumpers, and their small size makes them vulnerable to being outcompeted by larger or more boisterous fish.

Clown Killifish come from coastal West Africa, particularly Guinea, Liberia and Sierra Leone. They inhabit slow-moving, shallow waters, forest streams, swamps and small pools with abundant vegetation.

A group of Clown Killifish should be housed in an aquarium of at least 40 litres, with a footprint of approximately 60 × 30 cm providing useful swimming space. Use a secure, tightly fitted lid because they are accomplished jumpers, and leave some calm surface area alongside dense planting. Floating plants, Java moss, fine-leaved stems, gentle filtration and subdued lighting recreate their sheltered habitat. A dark, fine-grained substrate, driftwood and leaf litter can help them feel secure, while water movement should remain gentle, particularly at the surface.

Males reach about 3.5 cm (1.4 in), while females are usually smaller at around 3 cm (1.2 in).

Clown Killifish are small insectivores that naturally feed near the surface on tiny insects, larvae and other minute invertebrates. Offer small floating foods such as appropriately sized flakes and micro-pellets, supplemented with live or frozen foods including baby brine shrimp, daphnia, mosquito larvae and bloodworm in suitably small portions. Their upturned mouths make surface-feeding foods particularly appropriate, and varied feeding helps maintain their colour and condition.

Clown Killifish suit peaceful community aquariums containing similarly small fish. Good companions can include small rasboras, gentle tetras, pygmy Corydoras, Otocinclus and other calm nano species that do not compete aggressively at the surface. Avoid large fish, fin-nippers, predatory species and highly active tankmates, which may intimidate or consume them. They can be kept with shrimp, although very small shrimplets may be eaten, and males may be maintained together when the aquarium offers plenty of cover.

Clown Killifish are relatively straightforward to breed when provided with dense plants or spawning mops near the surface. A pair or small group will scatter adhesive eggs among fine-leaved plants, floating roots or woollen mops over several days. Remove the spawning material or transfer the eggs to a separate container, as adults may eat them. Eggs generally hatch after around 10 to 14 days, and the tiny fry require infusoria or another suitably fine first food before progressing to baby brine shrimp and other larger foods.

Males are more colourful and have larger, more elaborately patterned fins, with stronger red, yellow and blue markings. Females are generally smaller, rounder-bodied and less vividly coloured, with shorter, more plainly marked fins.