Multis need open sand, more empty shells than fish and a tank planned for a colony

A tank for Neolamprologus multifasciatus is mostly floor: open sand, a scatter of empty snail shells and room for a small colony to divide up. Seriously Fish calls this Lake Tanganyika fish probably the smallest known cichlid, at about 1.8 inches standard length.¹

In the lake, researchers at the University of Konstanz report, multis live in stable groups of up to 20 that last for years: a dominant male, adult females, juveniles and subordinate males. Each fish has its own home shell that it digs out of the lake floor and defends fiercely, while the group defends its territory together.²

1. Size the tank for the group you want

Seriously Fish gives 18 by 12 by 12 inches, about 10.6 US gallons (40 liters), for a single pair, and says a colony needs a larger tank. Each territory is usually no more than 6 inches across, so the floor area sets how many fish can claim space.¹

2. Lay sand at least 2 inches deep

Multis dig, so Seriously Fish asks for open sand at least 2 inches deep.¹

In the wild they excavate sand from inside their shells, leaving shell-filled hollows separated by ridges of sand.³

3. Add more shells than fish

Provide more empty shells than fish, spaced a little apart to ease squabbling between males; Seriously Fish suggests escargot shells. Females half-bury their chosen shell and lay eggs inside.¹

Shell quality matters. In a 2020 experiment with 3D-printed replicas, multis preferred shells that were intact, larger, longer or wider at the opening, and intactness counted most. Chipped or broken shells are the least useful.³

4. Match the water and stock the group

The profile lists 75–81°F (24–27°C), pH 7.5–9.0 and 8–25 dGH, with more females than males in a colony and mostly live and frozen foods.¹

Suggested tankmates use other parts of the tank: small rock dwellers such as smaller Julidochromis, or open-water Cyprichromis.¹

5. Keep the advice species-specific

All of these figures are for N. multifasciatus. Other shell-dwelling cichlids differ in size, group life and temper, so look up each species separately before mixing them or reusing this layout.