Cardinal Shrimp care guide
Cardinal Shrimp (Caridina dennerli) — minimum tank 40 L, temperature 27-30 °C, pH 7.8-8.5.
Compiled by Aquairi from published sources · Published · Updated
Overview
Cardinal Shrimp (Caridina dennerli) is a freshwater dwarf shrimp of the family Atyidae, listed in the Aquairi knowledge base as an expert-level species. It is an endemic Sulawesi Caridina that requires hard, alkaline and warm water — the opposite of the soft-water cantonensis lines. Stunning red-and-white Sulawesi Caridina from Lake Matano. Requires hard, alkaline, warm water — opposite of cantonensis. Endemic and increasingly threatened in the wild.
Taxonomy
- Family: Atyidae
- Genus: Caridina
- Scientific name: Caridina dennerli
- Common synonyms: Sulawesi Cardinal, White-spotted Sulawesi Shrimp
Habitat
Endemic Sulawesi Caridina inhabit the ancient lakes Matano, Mahalona and Towuti on the Indonesian island of Sulawesi. These tectonic lakes carry hard, alkaline, warm water — a chemistry unique among freshwater shrimp habitats — and the genus has radiated locally into many narrowly-distributed species. The Aquairi knowledge base records this entry from: Lake Matano, Sulawesi (Indonesia).
Tank requirements
- Minimum tank volume: 40 L (10.6 US gal)
- Adult size: 2-3 cm
- Temperature: 27-30 °C (81-86 °F)
- pH: 7.8-8.5
- GH: 6-8 °dGH
- KH: 4-8 °dKH
- Lifespan: 1-2 years
Diet
A grazing detritivore. In the aquarium the shrimp continuously feeds on biofilm, soft algae, decaying plant matter and dropped food. A small daily ration of a shrimp-formulated sinking pellet, occasional blanched spinach or zucchini and rare protein wafers keep the colony in good condition without polluting the water.
Compatibility
Peaceful and best kept in a colony of ten or more in a stable, well-cycled, planted aquarium. Suitable tank mates listed in the Aquairi knowledge base: Other Sulawesi shrimp, Tylomelania snails. Should be kept away from: Most fish, Cantonensis shrimp, Neocaridina.
Breeding
Reproduces in fresh water without a planktonic larval stage. Mature females develop ripe ovaries visible as a yellow or olive "saddle" on the back; after a successful moult they are fertilised by males and carry the fertilised eggs under the pleopods for roughly three to four weeks before juveniles hatch as miniature fully-formed shrimp. Stable parameters and absence of predation are the main success factors. Sulawesi shrimp breed at a slower rate than cherry shrimp; small clutch sizes (typically 8-20 eggs) and slow juvenile development demand long-term stability.
Cardinal Shrimp Breeding Guide (Caridina dennerli)
Overview
Caridina dennerli is an Atyidae shrimp endemic to Lake Matano on Sulawesi, Indonesia, where it lives among rocks and cliffs from the shallows down to about 10 metres. Unlike bee shrimp (Caridina cantonensis), it is a hard, alkaline, warm-water specialist: the lake sits near 27-31 C with a pH around 7.4. It is a direct developer, releasing fully formed shrimplets rather than free-swimming larvae, and is classed as an expert-level breeding subject. No wild specimens have been recorded since 2013, so captive populations carry conservation value.
Conditioning
Stable, mineral-rich alkaline water is the foundation. Reports of long-term success rely on remineralised RO water raised to roughly pH 7.8-8.2 with a dedicated Sulawesi mineral salt, GH near 6-8, and a steady temperature around 27-29 C. Lake Matano is ultra-oligotrophic, so nitrate, nitrite and phosphate should read effectively zero; the shrimp are not adapted to organic loading. Mature biofilm and a thin layer of detritus supply the bulk of the diet, supplemented sparingly.
Breeding Setup
A dedicated species tank of at least 40 litres with rock and rubble structure mimics the cliff habitat and gives shy adults cover. Keep a group of at least ten to reduce stress and improve the chance of pairing. Filtration must be gentle and biologically mature; the shrimp are highly sensitive to swings in temperature, pH and light, so heaters and any top-up water should be matched to tank parameters before addition.
Spawning & Berried Females
Females carry comparatively large eggs underneath the abdomen, fanned by the pleopods until hatching. Broods are small and development is slow, in line with the direct-developing strategy of Sulawesi Caridina. Because the eggs are large and yolk-rich, the female invests heavily per offspring, so populations build gradually rather than in the explosive way seen with Neocaridina.
Shrimplet/Larval Care
Hatchlings emerge as miniature versions of the adults and require no brackish or salt stage. They graze the same biofilm and detritus as the parents and should never be exposed to copper or untested medications. The main early-life risk is parameter instability rather than feeding, so changes should be small, slow and infrequent.
Common Challenges
The dominant difficulty is water consistency: the species needs mineral-rich yet alkaline, nutrient-poor water held stable, which is the opposite of bee-shrimp conditions and easy to get wrong. Sensitivity to fluctuation makes acclimation and transport risky. Slow reproduction and small broods mean colonies recover poorly from losses, and the lack of wild recruitment since 2013 makes responsible captive breeding important.