Quick answer

Set up a shell dweller cichlid tank with a sandy bottom, a group of 6-10 compatible fish, and at least one large shell per fish. Use a 10-20 gallon tank, keep the water hard and alkaline (pH 7.8-9.0, 72-82°F), and add a sponge filter or canister with gentle flow. Provide more shells than fish so each one can claim a home and retreat from aggression.

Tank size and water parameters

A 10-gallon tank works for a small colony of 4-6 shell dwellers, but a 20-gallon long gives you more floor space for shells and reduces territorial squabbles. These fish come from Lake Tanganyika, so they need hard, alkaline water: aim for pH 7.8-9.0, general hardness 10-20 dGH, and a stable temperature between 72-82°F. Use a sand substrate at least 1-2 inches deep because shell dwellers sift sand and rearrange it around their shells. Avoid gravel, which can trap waste and injure their mouths. A sponge filter or a canister filter with a gentle return works well; strong current stresses them and can push shells around.

Choosing and placing shells

Shell dwellers need large, sturdy shells they can fully enter. The opening should be wide enough for the fish to turn around inside. Place shells in clusters rather than evenly spaced rows, leaving open sand between clusters. Bury each shell so the opening faces slightly upward and the lip sits just above the sand. This mimics the snail shells they use in the wild and prevents them from rolling. Add at least one shell per fish, plus two or three extra to reduce competition. If you keep a breeding group, expect the fish to dig around the shells and move sand; that is normal behavior, not a sign of trouble.

Tank mates that work

Shell dwellers are territorial but small, so tank mates must be peaceful and occupy different water levels. Good choices include small cyprichromis, paracyprichromis, or a few synodontis catfish that stay near the bottom without competing for shells. Avoid other shell-dwelling species, large cichlids, and fast-moving fish that might nip fins or steal food. If you want a community feel, add a small school of peaceful mid-water fish, but keep the total bioload low. Do not mix shell dwellers with mbuna or other aggressive Tanganyikan cichlids; the shell dwellers will hide and stop breeding.

Feeding and maintenance

Feed a varied diet of high-quality cichlid pellets, frozen or live foods like daphnia and brine shrimp, and occasional spirulina flakes. Shell dwellers are omnivores that graze on microfauna in the sand, so avoid overfeeding. Feed once or twice a day, only what they eat in two minutes. Perform a 20-25% water change every one to two weeks, siphoning around shells carefully. Rinse filter media in tank water, not tap water, to preserve beneficial bacteria. Keep the water parameters stable; sudden shifts in pH or temperature can trigger stress and disease.

Step-by-step shell dweller setup

  1. Prepare the tank and sand: Rinse a 10-20 gallon tank and add 1-2 inches of sand. Place a sponge filter or canister filter with gentle flow. Fill with dechlorinated water and run the tank for at least 24 hours before adding fish. Checkpoint: water temperature should be stable at 72-82°F and pH between 7.8-9.0 before you buy fish.
  2. Arrange shells in clusters: Bury each shell so the opening faces slightly upward and the lip is just above the sand. Group 3-5 shells together with open sand between clusters. Use one shell per fish plus two extra. Common mistake: spacing shells evenly across the tank. Clusters let fish claim territories and reduce chasing.
  3. Acclimate and introduce fish: Float the bag for 15 minutes, then drip-acclimate over 30-45 minutes. Add the fish with the lights off and leave them undisturbed for the first day. Checkpoint: if fish hide for more than two days, check water parameters and reduce traffic near the tank.
  4. Add compatible tank mates: After the shell dwellers settle, add peaceful mid-water fish like small cyprichromis or a few synodontis catfish. Avoid other shell dwellers and aggressive cichlids. Common mistake: adding too many fish at once. Add one group at a time and monitor aggression.
  5. Feed and maintain water quality: Feed small amounts of cichlid pellets, frozen foods, and spirulina once or twice daily. Change 20-25% of the water every one to two weeks and siphon around shells gently. Checkpoint: ammonia and nitrite should stay at zero; nitrate below 20 ppm.
  6. Encourage breeding: Provide extra shells and keep the tank calm. Once a pair forms, the female will lay eggs inside a shell and guard the fry. Leave the fry with the parents unless the tank is crowded. Common mistake: moving shells or rearranging the tank during breeding. Let the pair settle and only remove fry if aggression increases.

Product facts

  • Shell Dweller Cichlid Large Shells (8 Pack): Handpicked large shells, larger than typical shell dweller shells sold on the market, also suitable for freshwater shrimp hideaways and hermit crabs. Larger shells give adult shell dwellers room to turn around and breed, and the 8-pack supplies enough homes for a small colony or a breeding group.
  • Mini Set of 3 Ducks (Mallards) Ornaments: Mini set of 3 mallard duck ornaments made from materials safe for aquatic environments, suitable for aquariums, terrariums, and vivariums, and designed to withstand water and humidity without fading or cracking. These add a visual break in the sand area without taking up shell space, and they are safe for the same hard, alkaline water shell dwellers need.