A stunning deep-red dwarf shrimp dotted with white spots and white-tipped legs, endemic to the ancient lakes of Sulawesi, Indonesia, where it is now critically endangered (and possibly extinct in the wild). It is beautiful but demanding, requiring warm, hard, alkaline water and rock-steady parameters that defeat most beginners.
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Lake Matano and the Malili lake system, Sulawesi, Indonesia
Origin
Old World
Climate
🌴 Tropical
Water type
💧 Freshwater
Family
Atyidae
Genus
Caridina
Part of the Freshwater shrimp
Small atyid and palaemonid shrimp kept in planted aquariums as peaceful algae-grazers and colorful colony animals. Care ranges from beginner-friendly Neocaridina to demanding species like the Sulawesi shrimp that need precise, stable water chemistry.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Warm hard-water specialist nano
10 gal (≈ 38 L), pH 7.8–8.4, 28–30 °C
Caridina dennerli ('cardinal') are Sulawesi lake endemics needing hard alkaline water (pH 7.8–8.4, GH 6–8, KH 4–6) AND warm temperatures (28–30 °C). Crushed coral substrate, mineralised RO, sponge filter, and rock structure.
Photo coming soon
Recommended
Dedicated Sulawesi biotope
20 gal (≈ 76 L), rock structure
A dedicated 20 gal Sulawesi biotope with lava-rock structure, crushed coral, heater set to 29 °C, and small frequent water changes with parameter-matched water. Species-only.
Photo coming soon
Ideal
Sulawesi show / breeding tank
20–30 gal, ATO + parameter logging
A larger Sulawesi-biotope tank with parameter logging, ATO, and stable warmth. These delicate shrimp reward careful keepers with steady reproduction and brilliant red colouration.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Larva
Most marine invertebrates hatch into microscopic planktonic larvae (such as the zoea of crustaceans or the bipinnaria/veliger of echinoderms and mollusks) that drift and feed in the water column. The larva looks nothing like the adult and undergoes major reorganization.
Photo coming soon
Juvenile
After settling out of the plankton, the juvenile takes on a recognizable miniature of the adult body plan — a tiny shell, a small star, or a translucent shrimp. Crustaceans grow by molting, shedding the exoskeleton to enlarge.
Adult
Adults reach full size and reproductive maturity with the species' mature shell, shape, or coloration. Many continue to molt or grow throughout life, and some show sex differences in size or claw/appendage shape.
Habitat & enclosure
Keep a colony in a dedicated, mature, cycled tank of 10 gallons (40 L) or more; this species does not tolerate the soft acidic water used for most Caridina. Replicate the Sulawesi rift lakes: temperature 80-86F (27-30C), pH 7.5-8.5, GH 4-6, KH 2-4, and TDS roughly 80-120. Stability is everything: avoid swings in temperature or chemistry. A bare or fine-sand bottom with lava rock and biofilm-covered surfaces suits them. Mature the tank for several weeks before adding shrimp, and acclimate very slowly by drip.
Substrate
Use an inert substrate such as fine sand or fine gravel, plus lava rock and porous stone that grow biofilm; avoid active 'buffering' aquasoils that lower pH, since this species needs alkaline water. Mineral-rich rock and crushed coral can help hold KH/GH stable.
Equipment & setup
Essential gear: a reliable heater to hold 80-86F, a gentle sponge filter (intake-safe for tiny shrimp), and a TDS/GH/KH test kit plus thermometer. A reverse-osmosis unit with a Sulawesi-specific remineralizer gives the most consistent water. Lighting to grow biofilm/algae is beneficial. Avoid any copper-containing equipment or additives.
Diet
Primarily a biofilm and aufwuchs grazer. A mature tank carpeted in microalgae and biofilm is the foundation of their diet. Supplement sparingly with high-quality shrimp foods, powdered biofilm boosters, blanched vegetables, and the occasional protein/algae wafer. Overfeeding fouls water fast in a small tank, so feed tiny amounts and remove leftovers. They breed continuously in good conditions, producing a few large eggs that hatch into miniature shrimp (no larval stage).
Behavior & temperament
Peaceful, social, and active grazers best kept in groups of 10 or more for natural behavior and breeding. They are non-aggressive and safe with snails and other peaceful tankmates, but are too small and delicate to mix with fish that might eat them. They are not handled; this is a display and aquascape animal. Their boldness increases as the colony settles into a stable, mature tank.
Health
Notoriously sensitive to parameter instability, copper, ammonia/nitrite spikes, and rapid changes. Most losses come from unstable or immature tanks, sudden water changes, or shipping/acclimation shock. Never use copper-based medications or fertilizers. Molting problems (the 'white ring of death') signal mineral or GH imbalance. Quarantine new livestock, keep nitrates low, and change water in small, parameter-matched increments. A drip acclimation over 1-2 hours dramatically improves survival of new arrivals.
Tips, DIY & hacks
Do not attempt this species until you have kept easier shrimp successfully. Set up and mature the tank for weeks before stocking, then add shrimp in one group via slow drip acclimation. Remineralize RO water to the exact target before each water change so parameters never swing. Lava rock seeded with biofilm is the single best 'food factory' you can add. Buy captive-bred stock, as wild populations are imperiled.
