Species description

Care, breeding and tankmates

Fish profile

Temperament

Semi-aggressive

Altolamprologus calvus is a peaceful cichlid toward larger species, but they are highly territorial and aggressive toward conspecifics, particularly other males. They are methodical, slow-moving predators that exhibit a calm and calculating demeanor. While they will not bother fish that are too large to be eaten, they will actively hunt and consume any small fish or fry that can fit into their mouths. Their behavior is centered around rock crevices, which they will defend vigorously against rivals.

Diet

Omnivore

In their natural habitat, Altolamprologus calvus is a specialized carnivore, preying on small crustaceans, invertebrates, and fish fry hidden in rock crevices. In captivity, they should be offered a protein-rich diet consisting of high-quality frozen or live foods such as mysis shrimp, brine shrimp, krill, and chopped seafood. High-quality cichlid pellets can also be introduced as a staple diet, though they may take time to accept dry foods. Because they are slow, deliberate feeders, care must be taken to ensure they are not outcompeted by faster tankmates.

Life expectancy

10-15 years

Under optimal care and in a well-maintained aquarium, Altolamprologus calvus has a lifespan of 10 to 15 years. Achieving this longevity requires stable water parameters, high-quality nutrition, and a stress-free environment. Because they are exceptionally slow growers, they take several years to reach their full adult size and coloration. Consistent maintenance, a proper diet, and compatible tankmates are key factors in helping them reach their maximum lifespan.

Sex ratio

Harem

In the aquarium, Altolamprologus calvus is best kept as a bonded pair or in a harem consisting of one male and multiple females. Due to the high male-to-male aggression, keeping multiple males in the same tank requires a very large volume and abundant rockwork to break lines of sight. When purchasing juveniles, it is common practice to buy a small group of six or more and allow them to pair off naturally. Once a compatible pair forms, the subdominant fish may need to be removed to prevent severe bullying.

Feeding frequency

Twice daily

Feeding Altolamprologus calvus once or twice daily is generally recommended to support their metabolic needs without overpolluting the water. Because they are slow and deliberate hunters, it is best to feed them in small portions that they can easily consume within a few minutes. Offering food slowly helps prevent uneaten items from sinking into unreachable crevices and decomposing. Younger, growing individuals may benefit from more frequent, smaller feedings to support their slow development.

Bioload

Medium

Altolamprologus calvus is a slow-growing species that does not produce a massive volume of waste compared to more active, larger cichlids, resulting in a low-medium to medium bioload. However, because they require high-protein, meaty foods, their diet can quickly foul the water if left unchecked. A high-quality filtration system with efficient mechanical and biological media is necessary to process these nitrogenous compounds. Routine partial water changes are essential to maintain the pristine, stable conditions this species requires to thrive.

Flow

Stagnant

This species prefers a moderate water flow that mimics the conditions of their native Lake Tanganyika shorelines. Strong currents should be avoided, as Altolamprologus calvus is not built for constant fast swimming and prefers to hover motionlessly near rocks. It is important to structure the rockwork to create areas of calm, sheltered water where they can rest and establish territories. High oxygenation is also critical, so moderate flow combined with an airstone or surface agitation is ideal.

Jump risk

Yes

Although Altolamprologus calvus is not typically classified as a highly active jumper, they can display sudden bursts of speed when startled or during territorial disputes. If they feel threatened or chased by dominant tankmates, they may dart upward and launch themselves out of the tank. To prevent such accidents, a tight-fitting lid or cover slides are highly recommended. Ensuring there are no large gaps around filter pipes or cables will guarantee the safety of these cichlids.

Reproduction

Oviparous

Breeding Altolamprologus calvus is a fascinating but slow process that requires patience and a specific tank setup. They are cave spawners, and the female requires a tight crevice, cave, or shell that is large enough for her but too small for the larger male to enter. The female lays her eggs inside the shelter, and the male fertilizes them from the entrance by releasing his milt, which is swept inside by the female's fanning. The female will stay inside to guard and care for the eggs and fry, while the male patrols the outer territory.

Compatibility & tankmates

Altolamprologus calvus is highly compatible with other medium-sized cichlids from Lake Tanganyika, such as Julidochromis, Neolamprologus, and Cyprichromis. However, they should not be housed with very small fish, dwarf shrimp, or tiny fry, which they will readily view as prey. Extremely aggressive cichlids should also be avoided, as they can stress the relatively peaceful and slow-moving Calvus. Providing distinct territories with plenty of rocks will ensure peaceful coexistence among different species.

Tank level

Middle/Bottom

This cichlid is predominantly a bottom-to-middle dweller, staying closely tied to the aquarium's rockwork and caves. They use their extremely compressed bodies to slide into narrow vertical cracks and crevices, where they feel most secure. While they may occasionally venture into the open water during feeding times, they rarely swim near the surface. Providing vertical structures and deep caves in the lower portions of the tank is crucial to accommodate their natural swimming and sheltering preferences.