OB Compressiceps Care Guide - Setup, Diet & Breeding

OB Compressiceps are a striking ornamental form of the Malawi predator cichlid Dimidiochromis compressiceps. Their laterally compressed bodies, elongated snouts and bold irregular orange, red, black and cream blotches give them a dramatic appearance, with every individual showing a different pattern.

The body shape is highly distinctive: tall through the front half but unusually narrow from side to side, allowing the fish to move through dense vegetation and rocky cover. Their long dorsal and anal fins add to their sleek, predatory profile, while the mouth is adapted for seizing smaller fish.

In the aquarium, they are confident, alert cichlids that spend much of their time patrolling open water and investigating their surroundings. They are predators by nature and can be territorial, particularly mature males, although their behaviour varies between individuals and available space.

In Lake Malawi, Dimidiochromis compressiceps is often associated with Vallisneria beds and other cover, where its narrow body helps it move stealthily among stems. The OB pattern is a captive-trade colour form rather than the typical wild appearance, making these fish especially popular with aquarists who enjoy unusual Malawi cichlid varieties.

The OB Compressiceps is a selectively bred colour morph of Dimidiochromis compressiceps, a cichlid endemic to Lake Malawi in East Africa. The species occurs around rocky shores, vegetated areas and sheltered habitats throughout the lake.

A single adult or compatible group should have at least 300 litres, with a tank around 150 cm long and 45–60 cm wide providing a better footprint for this active predator. Use a secure cover, strong filtration and plenty of open swimming space, alongside rockwork arranged into separated territories. Smooth rocks, caves and hardy plants such as Vallisneria can provide shelter and visual barriers. A fine sand or rounded-gravel substrate suits their natural lake environment and avoids sharp edges.

Males can reach about 25 cm (10 in), while females are usually smaller at around 18–20 cm (7–8 in).

OB Compressiceps are carnivorous predators and should be offered a varied diet based on high-quality carnivore pellets or granules, supplemented with foods such as mysis shrimp, krill and other suitably sized frozen or prepared marine foods. Young fish can take finely sized foods. Avoid relying on mammal meat, and do not make heavily vegetable-based foods the main part of the diet.

Suitable companions include robust Malawi cichlids of comparable size, particularly peaceful to moderately assertive haps and selected peacocks. Avoid small fish, slow-moving species and delicate community fish, which may be viewed as prey. It is also unwise to combine them with highly aggressive mbuna or similarly predatory species that compete strongly for territory. Keep only one male unless the aquarium is exceptionally large, with several females available to spread attention.

OB Compressiceps are maternal mouthbrooders. Breeding is most successful with one mature male and several females, as males can be persistent and aggressive during courtship. The male displays over a chosen spawning site, while the female collects the fertilised eggs into her mouth and incubates them for around three weeks. She releases fully formed fry, which can be raised separately and fed newly hatched brine shrimp or other suitably small foods.

Males are larger and generally develop stronger colour, more extended fins and more pronounced egg spots than females. Females are smaller, often less vividly marked and have a rounder body, especially when carrying eggs.