Splendid Killie (Aphyosemion splendopleure) — 3-4cm

Overview

The Splendid Killie (Aphyosemion splendopleure) is a beautifully coloured, peaceful West African killifish native to the freshwater brooks and streams of Cameroon, Equatorial Guinea, and Gabon. Reaching 4cm in length, this species is renowned for its vibrant metallic colouration, elegant finnage, and suitability for planted nano aquariums. Ideal for quiet species tanks with soft, clean water and live foods, Aphyosemion splendopleure thrives in covered setups with subdued lighting. Available for sale UK from Tropical Fish Co, this captivating killifish rewards dedicated keepers with a living jewel that shimmers with iridescent blues, greens, and reds.

Appearance and Coloration

The Splendid Killie displays stunning metallic colouration with a slender body adorned in shimmering blues, greens, yellows, and reds. Males are more intensely coloured than females, with elongated dorsal and anal fins that feature intricate patterning and iridescent highlights. The caudal fin is often lyre-shaped or elongated, creating an elegant silhouette. Females are smaller, plumper, and more subdued in colour. Under subdued lighting in a planted tank with dark substrate and tannin-stained water, the colours become even more vibrant and eye-catching.

Natural Habitat

Aphyosemion splendopleure is found in brooks and streams in Cameroon, Equatorial Guinea, and Gabon. These fish inhabit shallow, slow-moving waters characterised by soft, slightly acidic, tannin-rich water, dense vegetation, submerged roots, and abundant leaf litter. Water flow is minimal, and the substrate consists of mud, sand, and organic debris. During the wet season, these fish spawn among fine-leaved plants or submerged vegetation; during the dry season, some populations may experience reduced water levels.

Aquarium Setup

A minimum 20-litre aquarium is sufficient for a pair or small group of Splendid Killies. Use a fine sand substrate with plenty of live plants such as Cryptocoryne, Java moss, Microsorum, and floating species like Limnobium or Salvinia. Add dried leaves (Indian almond or oak) to release tannins and replicate the natural blackwater environment. Provide spawning mops or fine-leaved plants for egg deposition. Lighting should be dim, and filtration gentle to avoid strong currents. A secure, tight-fitting lid is essential, as killifish are skilled jumpers.

Feeding and Diet

As a carnivore, Aphyosemion splendopleure requires a varied, protein-rich diet to maintain health and colour. Offer small live or frozen foods such as daphnia, baby brine shrimp, mosquito larvae, bloodworms, and grindal worms daily. High-quality micro-pellets or flakes may be accepted, but live and frozen foods are essential for conditioning and breeding. Feed small portions twice daily, removing uneaten food promptly to maintain pristine water quality. Variety and freshness are critical for optimal health and vibrant colouration.

Behaviour and Temperament

The Splendid Killie is a peaceful, shy species that spends most of its time in the upper and middle water column among plants. Males may display to each other with flared fins and subtle posturing, but serious aggression is rare. These fish are most active during dawn and dusk, and they appreciate dimly lit aquariums with plenty of cover. They are not competitive feeders, so avoid housing them with boisterous or fast-moving species. In a well-planted species tank, they display natural behaviours and may spawn regularly.

Suitable Tank Mates

Aphyosemion splendopleure is best kept species-only or with very small, peaceful, non-competitive fish that share similar water requirements in a well-structured tank. Suitable companions include small peaceful bottom dwellers such as pygmy Corydoras or small peaceful dwarf catfish in larger setups. Shrimp and fry are likely to be eaten. Avoid large fish, aggressive species, fin-nippers, boisterous community fish, and fast competitive feeders. A calm, quiet environment is essential for this delicate killifish to thrive.

Breeding

Aphyosemion splendopleure can be bred in captivity in a well-conditioned pair or small group. Provide fine-leaved plants, spawning mops, or peat/moss for egg deposition. Eggs are often laid among plants and may benefit from separate incubation in moist or water-based conditions. Fry are tiny and require infusoria or liquid fry food initially, graduating to newly hatched brine shrimp after a few days. Remove adults to prevent egg and fry predation. Breeding success is highest in soft, slightly acidic water with excellent water quality.

Why Buy from Tropical Fish Co

Tropical Fish Co is a trusted UK supplier of rare and specialist tropical fish, including hard-to-find killifish species like Aphyosemion splendopleure. We guarantee healthy, well-conditioned stock, expert care advice, and secure nationwide delivery. Every fish is quarantined and inspected before dispatch, ensuring you receive only the finest specimens. Whether you're setting up a dedicated killifish tank or adding a rare species to your collection, Tropical Fish Co offers unmatched quality and customer service. Order online today and bring the beauty of West African waters into your home aquarium.