The Clown Killifish, scientifically known as Epiplatys annulatus, is a diminutive yet strikingly colorful freshwater fish, native to the slow-moving and stagnant waters of West Africa, particularly in countries like Liberia, Sierra Leone, and Guinea. Renowned for its vibrant colors and peaceful demeanor, the Clown Killifish is a popular choice among aquarists, especially those with nano or planted tanks. This species is characterized by its slender body and dramatic coloration, with males displaying a spectacular array of colors—typically, a blue body with bold, vertical stripes and flamboyant fins adorned with red and black bands, resembling the pattern of a clown's attire, hence its common name.

Clown Killifish are relatively small, making them an excellent choice for smaller aquarium setups. They thrive in environments that mimic their natural habitat, which includes plenty of plant cover and soft, acidic to neutral water. Floating plants are particularly appreciated, as they provide shelter and mimic the shaded environments these fish are accustomed to. Despite their preference for calm waters, they do well in a range of tank conditions, provided extreme parameters are avoided.

The diet of Epiplatys annulatus is omnivorous, with a strong preference for small live or frozen foods in captivity. In the wild, their diet consists mainly of small insects and larvae. To ensure a balanced diet, they should be offered a variety of foods, including daphnia, brine shrimp, micro worms, and quality flake or micro pellet foods. This varied diet helps maintain their vibrant colors and overall health.

Breeding Clown Killifish is relatively straightforward and can be a rewarding experience for hobbyists. They are non-annual killifish, meaning they do not require a dry period for their eggs to hatch. Females lay eggs among dense vegetation or spawning mops, which can then be transferred to a separate breeding tank to hatch. The fry are small and should be fed infusoria or other suitably sized foods until they are large enough to accept larger fare.

Caring for Clown Killifish involves maintaining clean water with regular water changes and careful monitoring of water parameters to ensure their well-being. They are best kept in groups, as they are social fish that display more natural behaviors when in the presence of conspecifics. However, due to their small size and somewhat timid nature, care should be taken when choosing tank mates to prevent predation or competition from larger, more aggressive fish.

In summary, the Clown Killifish, Epiplatys annulatus, offers aquarists the opportunity to keep a small, peaceful, and extraordinarily colorful species that adds a vibrant splash of color and activity to the aquarium. While their care requires attention to their specific environmental and dietary needs, the rewards of keeping Clown Killifish include the enjoyment of their unique appearance and fascinating behaviors, making them a delightful addition to the community or species-specific aquarium setups.