Fasciatus Shell Dweller

Altolamprologus fasciatus is a predatory cichlid endemic to Lake Tanganyika in East Africa. It has an unusual build: a laterally compressed, armoured body and a large mouth that let it wedge into rock crevices and strike at prey. Females stay much smaller than the 15 centimetre males and breed inside empty snail shells, which is the source of the shell dweller trade name, even though this fish is not a true dwarf shell-dweller like the smaller Neolamprologus species.

This is an ambush carnivore rather than a community omnivore. In the lake it preys on shrimp and young cichlids, and in the aquarium it should share space only with Tanganyikan fish too large to swallow; small fish, fry, and dwarf shrimp will be eaten. It is otherwise slow-moving and not especially aggressive toward tankmates its own size, so it combines well with robust Tanganyikans such as Julidochromis or larger Neolamprologus. Feed meaty foods: frozen mysis, krill, and good-quality pellets suit it.

Lake Tanganyika is hard and alkaline, so keep this fish at a high pH around 8 to 9, moderate to high hardness, and 24 to 27 degrees Celsius, in a 150 litre or larger tank built from rock piles with scattered snail shells. Breeding follows the wild strategy: a female adopts a shell, lays inside it, and guards the entrance, while the larger male defends the surrounding territory. Because the female fits where the male cannot, the pair naturally divides the work. Given shells and stable hard water, a settled pair will spawn and produce small batches of well-hidden fry.