Calvus Cichlid Care Guide - Aquarium Setup, Diet & Breeding

The Calvus Cichlid has a laterally compressed, elongated body that allows it to slip into narrow cracks and crevices. Its dark grey, brown or blackish base colour is overlaid with pale vertical bars and fine spotting, while the elongated fins and pointed head give it a notably angular appearance. Several colour forms occur across Lake Tanganyika, including striking black, white and yellowish regional varieties.

This species is a stealthy predator rather than an active open-water swimmer. It moves carefully among rocks and uses its slim profile to approach small prey in places that larger cichlids cannot reach. Although it can be shy when newly introduced, an established Calvus often becomes an observant and confident presence.

In the wild, Calvus Cichlids live among steep rocky habitats, crevices and empty shells in the clear waters of Lake Tanganyika. Their compressed shape and tough scales are well suited to squeezing through tight spaces while avoiding injury from rough rock surfaces.

Altolamprologus calvus is closely related to the Compressiceps Cichlid, but is generally more slender and more strongly laterally compressed. It is a fascinating example of the specialised cichlid diversity that has evolved in Lake Tanganyika.

Calvus Cichlids are endemic to Lake Tanganyika in East Africa, particularly the rocky southern and southwestern shorelines. They inhabit clear, alkaline water around rocky reefs and areas scattered with empty snail shells.

A single Calvus Cichlid needs an aquarium of at least 150 litres, with a footprint of roughly 90 cm by 45 cm; a larger tank is preferable for a pair or community. Build a stable arrangement of limestone or other aquarium-safe rocks with plenty of narrow crevices, overhangs and sheltered caves, and provide empty escargot-style shells or similarly sized spawning shelters. Use fine sand or another smooth substrate, leave open areas for movement, and ensure all rockwork is secure before adding the fish.

Males can reach around 15 cm (6 inches) in length, while females are usually smaller at approximately 10–12 cm (4–4.7 inches).

Calvus Cichlids are carnivorous predators that naturally consume small fish, crustaceans, insect larvae and other invertebrates. Offer a varied diet of high-quality carnivorous cichlid pellets or granules supplemented with frozen or live foods such as mysis shrimp, brine shrimp, krill fragments and bloodworm. Feed modest portions that can be eaten quickly, and avoid relying on large, fatty foods.

Suitable tankmates include peaceful to moderately assertive Lake Tanganyika cichlids occupying different areas, such as Julidochromis, Neolamprologus shell dwellers and carefully selected Cyprichromis in a sufficiently large aquarium. Avoid mixing them with highly aggressive Mbuna, large predatory cichlids or boisterous species that will monopolise the rockwork. They may prey on very small fish and can be territorial around caves and spawning sites, so overcrowding and combining multiple adult males should be avoided.

Calvus Cichlids are secretive cave spawners that usually breed in shells, narrow crevices or small caves. The female enters the chosen shelter and attaches a small batch of eggs to the roof, while the larger male fertilises them from outside or from the entrance. After hatching, the female guards the fry, which can be raised on newly hatched brine shrimp and other suitably tiny foods. A bonded pair is generally the most practical breeding arrangement, although finding a compatible pair from a group of juveniles is often easier than introducing two unrelated adults.

Males are typically larger and may develop more extended fins and a heavier, more robust build. Females remain noticeably smaller and more compact, a difference that becomes clearer once the fish are mature.