Magdalena Spot-Finned Killie (Rachovia brevis) — > 2,5cm

Overview

Magdalena Spot-Finned Killie (Rachovia brevis) is a beautifully patterned Colombian killifish that captivates specialist keepers with its delicate coloration and peaceful nature. Native to the Magdalena River basin in Colombia, this species inhabits calm, heavily vegetated waters and is well-suited to the planted aquarium. Now available for sale UK from Tropical Fish Co, this small and elegant killifish is ideal for the dedicated aquarist seeking a rewarding breeding project and a splash of South American charm.

Appearance

The Magdalena Spot-Finned Killie is a tiny species, typically reaching around 3 cm in total length. Males display intricate patterns of red, gold, and blue markings across their flanks and fins, with the fins often showing delicate spotting or edging. The overall effect is subtle yet striking, especially under subdued lighting. Females are smaller and more subdued in color, usually showing a pale olive or tan background with minimal patterning. Healthy specimens have bright, clear eyes and smooth, unblemished scales.

Natural Habitat

In the wild, Rachovia brevis inhabits slow-moving streams, forest pools, and heavily vegetated backwaters in the Magdalena River basin of Colombia. The water is typically soft, warm, and slightly acidic, with dense aquatic vegetation providing cover and spawning sites. The substrate is composed of fine mud, sand, and decomposing plant matter, and the water is often stained with tannins from leaf litter and driftwood. These habitats experience seasonal fluctuations in water level, though not as extreme as those inhabited by true annual killifish.

Aquarium Setup

A small aquarium of at least 20 litres is sufficient for a pair or small group of Magdalena Spot-Finned Killie, though larger tanks are always beneficial. Use a fine, dark substrate and incorporate plenty of live plants such as Java moss, Java fern, and Cryptocoryne species, along with floating plants to provide cover and reduce lighting. Add driftwood or dried leaves to replicate the tannin-rich waters of their natural habitat. Filtration should be gentle but effective, and a tightly fitting lid is essential, as killifish are excellent jumpers. Subdued lighting and minimal water movement will help the fish settle and display their best colors.

Feeding

The Magdalena Spot-Finned Killie is a carnivore and requires a varied, protein-rich diet to thrive. Offer small live and frozen foods such as daphnia, brine shrimp, bloodworms, and other appropriately sized meaty foods daily. Very small foods are preferred over larger items, which may be difficult for such a tiny species to consume. Feed twice daily in small portions to avoid overfeeding and maintain pristine water quality. A varied diet will enhance coloration and support breeding condition.

Behaviour

This killifish is peaceful and undemanding, spending much of its time exploring the lower and middle levels of the aquarium among plants and cover. Males may engage in gentle territorial displays, fanning their fins and showing off to rivals or potential mates, but serious aggression is uncommon. They are best kept in a quiet, well-planted tank where they can feel secure. A ratio of one male to two or three females is ideal, as this reduces male-on-male competition and encourages natural breeding behaviors.

Tank Mates

The Magdalena Spot-Finned Killie is best kept in a species-only setup, where its delicate nature and specific care requirements can be fully appreciated. If tankmates are desired in a larger aquarium, choose only very small, peaceful, non-competitive species. Avoid any large, aggressive, or fast-moving fish, as well as fin-nippers and active community fish that may disturb eggs or outcompete them for food. Very small shrimp and fry may be eaten.

Breeding

Breeding the Magdalena Spot-Finned Killie is a rewarding experience for dedicated keepers. This species typically spawns among fine-leaved plants or spawning mops, and eggs are usually laid among vegetation. Eggs can be removed for separate incubation to protect them from being eaten by adults. Provide soft, clean water and abundant live foods to condition breeding adults. Fry are tiny and require infusoria or liquid fry food initially, graduating to baby brine shrimp as they grow. Maintain stable water parameters and excellent water quality throughout the breeding process.

Why Buy from Tropical Fish Co

Tropical Fish Co is a trusted UK aquatics specialist offering rare and beautiful killifish species like the Magdalena Spot-Finned Killie direct to your door. Every fish is carefully quarantined, health-checked, and packed with expert care to ensure safe arrival. With transparent pricing, fast UK delivery, and a knowledgeable support team on hand to answer your questions, we make it easy to add stunning, specialist species to your collection. Whether you're an experienced killifish enthusiast or a curious newcomer, we're here to help you create a thriving aquarium. Order online today and discover why so many UK aquarists trust Tropical Fish Co for quality and service.