Cardinal Sulawesi shrimp (Caridina dennerli) need a dedicated, mature aquarium with warm, alkaline water. Their red bodies and white feet are distinctive, but their water requirements make them a specialist choice. Buy captive-bred shrimp and ask the breeder for the actual conditions used to raise that colony.
Which Sulawesi shrimp are you buying?
“Sulawesi shrimp” covers multiple species from Indonesia, not different colors of one animal. This guide focuses on cardinal shrimp from Lake Matano. Blue-leg Poso shrimp and other lake species require identification and their own care information; do not assume every Sulawesi species belongs in the same aquarium.
If this is your first shrimp tank, cherry shrimp are a more practical starting point. Even within bee shrimp and cardinal shrimp, belonging to the same genus does not mean needing the same water.
Prepare the aquarium before buying shrimp
For a starter colony, plan around a 10–20-gallon aquarium; the extra water volume offers room for maintenance errors. This is a planning recommendation, not a shrimp-per-gallon stocking formula. Complete a fishless cycle and allow grazing surfaces to develop before introducing animals.
Use stable rockwork with shaded crevices and an inert substrate. Avoid active soil designed to lower pH. Fit a sponge filter or protect other filter intakes with fine sponge. Provide surface movement and aeration, particularly at the warm temperatures used for these shrimp.
Sulawesi Keepers’ husbandry guidance stresses mature filtration, stable mineral composition and smaller regular water changes. Clear water alone does not establish that a tank is ready.
Water: follow a measured mineral recipe
A practical cardinal shrimp temperature target is 27–29°C (81–84°F), checked with a separate thermometer. Aquarium Glaser’s account of captive-bred cardinal shrimp recommends warm conditions and notes sensitivity to unfavorable transport temperatures. Avoid a cool room-temperature tank or sudden changes during introduction.
Use the breeder’s established pH and mineral recipe rather than adjusting an arbitrary tap-water supply with calcium products. At Ostrava Zoo, cardinal shrimp were maintained at 28–29°C and pH 8.5. That is a documented example, not proof that every colony needs identical numbers.
RO water remineralized with a suitable Sulawesi product makes preparation repeatable. For example, Sulawesi Mineral 8.5 instructions specify approximately 7°dGH and conductivity of 220 ± 40 µS/cm. Those figures apply to that product; conductivity is not the same measurement as a TDS reading in ppm.
Prepare replacement water outside the aquarium and follow the product’s dissolving instructions. If CO₂ is used to dissolve this particular mineral, the manufacturer requires at least three hours of subsequent aeration to expel it before use. Match temperature and check the prepared water before changing water. Replace evaporation with unmineralized RO water because minerals remain behind.
Keep ammonia and nitrite undetectable and nitrate low. Do not use cuttlebone as a guaranteed pH controller or add calcium blindly: neither establishes a balanced mineral composition. Maintain a record of pH, GH, KH and conductivity so a change can be investigated instead of guessed at.
Food, companions and breeding
Leave established biofilm on grazing surfaces and offer small portions of suitable shrimp food. Observe feeding and remove leftovers rather than repeatedly adding powder because shy shrimp are out of sight. The zoo’s cardinal shrimp often sheltered beneath rocks, with their white legs easier to spot than their bodies.
A species-only colony is the simplest arrangement for monitoring feeding and reproduction. Fish introduce predation risk, and cherry shrimp are not automatic companions for this warm setup. Identify any proposed snail and check its adult size and conditions separately.
Cardinal shrimp can reproduce in freshwater; they do not need the separate saline larval-rearing system used for Amano shrimp. Protect tiny young from filter intakes and preserve their grazing surfaces. A berried female is encouraging, but a colony is established only when young survive and grow.
