The Clown Killifish is a tiny, colorful species from West Africa with striking bands and a flame-like tail, perfect for planted nano aquariums.
Overview
Epiplatys annulatus is one of the smallest and most visually striking members of the family Nothobranchiidae, widely known among aquarists as the Clown Killifish or Banded Panchax. In the wild, this species inhabits shallow streams, marshes, and flooded savanna areas of West Africa — specifically in Guinea, Sierra Leone, and Liberia — where it lives in warm, soft water among dense bankside vegetation.
Adults reach just 3–4 cm in length and live for 3–4 years with proper care. Despite their diminutive size, Epiplatys annulatus possesses a truly memorable appearance: the body is adorned with alternating vertical black and golden-cream bands, while the caudal fin of males displays vivid red, blue, and yellow hues that resemble a candle flame. Females are more modestly colored — their bands are less contrasted and the tail lacks the same vibrant patterning.
Epiplatys annulatus has an aggression level of 2 out of 5, making it an entirely peaceful and calm fish. Unlike many other killifish, this species is non-annual — the eggs do not require a dry incubation period. Thanks to their small size, striking coloration, and relative hardiness, Clown Killifish have become one of the most popular inhabitants of nano aquariums worldwide.
Tank Requirements
A small group of Epiplatys annulatus can be comfortably housed in an aquarium of just 20 liters, making them ideal candidates for nano setups. Optimal water parameters are:
- Temperature: 22–26 °C
- pH: 6.0–7.5
- Hardness (GH): 5–15 dGH
In the wild, Clown Killifish live near the water surface among dense vegetation, and this behavior should guide the aquarium setup. Floating plants are essential: water lettuce, salvinia, riccia, or Amazon frogbit provide natural shading and give the fish a sense of security. It is near the surface, among the roots and leaves of floating plants, that Epiplatys annulatus spends most of its time.
A dark substrate is preferable — it makes the banded coloration of the fish appear most vivid. The aquarium should be densely planted with fine-leaved species: Java moss, cryptocorynes, and bucephalandra. Driftwood and Indian almond leaves will tint the water a subtle amber, bringing conditions closer to their natural biotope.
Water flow should be minimal — in nature, these fish inhabit nearly still water. A sponge filter (air-driven) is the optimal choice, providing biological filtration without creating a strong current. The aquarium must be fitted with a tight-fitting lid, as Epiplatys annulatus are excellent jumpers and will readily escape from an open tank.
Feeding and Diet
Epiplatys annulatus is a micro-predator that feeds on tiny insects, their larvae, zooplankton, and other small invertebrates at the water surface in the wild. In the aquarium, these preferences persist — the fish most readily take food from the surface and upper water layers.
Suitable foods include:
- Staple diet: high-quality micro-pellets and small flakes for tropical fish
- Live and frozen foods: baby brine shrimp, micro-worms (grindal worms, nematodes), small cyclops, daphnia
- Supplemental: small mosquito larvae, wingless fruit flies (a prized treat for surface feeders)
Feed 1–2 times daily in very small portions. Live and frozen foods play a vital role in the diet — it is with such nutrition that Epiplatys annulatus displays its most vibrant coloration. Wingless fruit flies are an especially valuable food, as they mimic natural prey at the water surface. Avoid large foods — the small mouth of the Clown Killifish cannot handle big pellets or whole bloodworms.
Care and Maintenance
The care difficulty of Epiplatys annulatus is rated 2 out of 5 — this is a fairly hardy species suitable for aquarists with minimal experience. Nonetheless, stability of water parameters is of key importance.
Weekly water changes of 15–20% are mandatory. In nano aquariums, water parameters shift significantly faster than in larger volumes, so regularity of maintenance is critically important. Monitor ammonia and nitrite levels — these must be strictly at zero. Nitrates should ideally be kept below 20 mg/L.
Keep Epiplatys annulatus in a group of 6–8 individuals, including several males — in a group the fish behave more confidently, and males display more intense coloration as they compete for female attention. Solitary keeping leads to stress and faded colors.
An important consideration: watch the temperature regime. Clown Killifish tolerate prolonged temperatures above 28 °C poorly. When performing maintenance, add new water slowly, pre-heated to the tank temperature — sudden parameter shifts are undesirable for these small fish. Regularly check the lid for gaps — these fish find the smallest openings to jump through.
Compatibility
Epiplatys annulatus is a peaceful fish perfectly suited for a species-only nano aquarium or community tanks with other calm micro species. When selecting tankmates, the key rule is: no large or fast fish that would frighten or outcompete the Clown Killifish at feeding time.
Ideal tankmates:
- Small rasboras: Chili Rasbora, Spotted Rasbora
- Small tetras: Ember Tetra, Green Neon Tetra
- Dwarf corydoras: Pygmy Corydoras — an excellent bottom-dwelling companion
- Peaceful dwarf shrimp (Neocaridina) — Clown Killifish pose no threat to them
Unsuitable tankmates:
- Large or active fish (barbs, danios, large tetras)
- Aggressive species, including Betta fish
- Predatory fish that would view miniature killifish as prey
- Large shrimp (Amano) that may compete for food
In a community aquarium, Epiplatys annulatus occupies the upper water layer, making them an excellent complement to species inhabiting the middle and lower zones. This natural distribution of zones helps avoid conflict and creates a harmonious community.
Breeding
Breeding Epiplatys annulatus is rated 3 out of 5 in difficulty. While not the easiest species to breed, obtaining offspring is entirely achievable with proper preparation, even in a home aquarium.
Unlike many killifish, Epiplatys annulatus is a non-annual species — the eggs do not require a dry incubation period. The fish lay eggs daily in small batches of a few eggs at a time, attaching them to fine-leaved plants, Java moss, or the roots of floating plants near the water surface.
For targeted breeding, prepare a small spawning tank (10–15 liters) with the following water parameters:
- Temperature: 24–26 °C
- pH: 6.0–6.5
- GH: 5–8
Place clumps of Java moss or a spawning mop near the water surface. Introduce a pair or small group (1 male and 2–3 females), ensuring generous live food feeding. The male courts females by spreading his fins and displaying the vivid coloration of his tail.
The eggs are small, transparent, and weakly adhesive. Incubation takes 10–14 days at 24 °C. Moss containing eggs can be periodically transferred to a separate container to improve survival rates — adult fish will readily consume both eggs and fry. Newly hatched larvae are extremely small and feed on infusoria and microorganisms for the first few days. After 5–7 days, baby brine shrimp and micro-worms can be introduced. Fry grow slowly and achieve adult coloration by 2–3 months of age.