Nimbochromis polystigma

The polystigma takes its name from the many small brown spots covering its body ("many-spotted"). It is a large, big-mouthed predator from the same genus as the livingstoni and venustus. The head of mature males turns metallic blue and the fins take on yellowish tones; females keep their spotted pattern. It waits motionless near rocks and plants and catches approaching small fish.

• At least 600 liters and 180 cm in length for an adult group.
• A wide open sand area and sturdy rock groups along the sides.
• Hard and alkaline water (pH 7.8–8.5); aragonite substrate or Malawi salt.
• Strong filtration and weekly 40–50% water changes.

Carnivorous. A large cichlid pellet should be the staple; it is varied with frozen mysis, krill, shrimp and fish meat. Live feeder fish carry a disease risk and are not necessary.

It is measured toward fish of its own size, but it hunts any fish that fits in its mouth. As males mature, they become territorial toward males of their own species. Because it can hybridize with other Nimbochromis species, a single species should be kept in a harem aquarium.

Good companions: large haps such as the Malawi eye-biter, blue dolphin cichlid, electric blue ahli and Fossorochromis rostratus, large Synodontis catfish suited to hard water.

Avoid: other Nimbochromis species (hybridization), mbuna and small Aulonocara species, any fish that fits in its mouth, community fish, shrimp and snails.