Sulawesi profile
Sulawesi Harlequin shrimp
Caridina woltereckae
Sulawesi Harlequin shrimp are specialist Caridina woltereckae that need warm, alkaline, stable lake-style conditions and a mature biofilm-rich setup.
Written by
- Published
- Updated
Quick verdict
Suitable for: Experienced Sulawesi shrimp keepers with a dedicated species tank. Watch especially: keep warm and alkaline.
Quick care card
Use this card as a starting point. Always check whether your aquarium is stable enough for sensitive species.
Temperature
27 - 30 °C
pH
7.8 - 8.5
GH
5 - 8 °dH
KH
3 - 5 °dH
TDS
80 - 180 ppm
Aquarium
From 60 liters
Difficulty
Expert
Behavior
Peaceful but very sensitive Sulawesi shrimp
Feeding
Biofilm, algae films, microorganisms and very small controlled food portions
Breeding
Can breed in freshwater, but only under mature stable specialist care
Best match
Experienced Sulawesi shrimp keepers with a dedicated species tank
Important
This is not a casual shrimp. Use cautious stocking, no active soil, no cool soft-water setup and no immature aquarium.
Care in practice
These are the points that most often make the difference between survival and a stable colony.
Use warm alkaline water around 27-30 degrees Celsius, pH 7.8-8.5 and stable Sulawesi-style mineralized RO water. Keep oxygen high, waste low and water changes small and matched.
Use a dedicated mature rocky tank with inert substrate, protected filtration, no active soil and plenty of hardscape for biofilm. Long maturation is important before adding this species.
Rely mainly on biofilm and surface grazing. Add tiny amounts of fine shrimp food or algae-based food only when needed. Avoid overfeeding because water quality can deteriorate quickly.
Harlequin shrimp are peaceful and should be kept in a calm group without active fish. They need low stress and stable routines.
A species-only tank is safest. Do not combine with cool-water shrimp, soft-water Caridina, active substrate setups or fish that disturb grazing.
Breeding is freshwater with direct development, but it is best considered advanced. Young need constant biofilm, stable warm alkaline water and a safe filter intake.
Common mistakes are buying them before mastering Sulawesi water, using active soil, adding them to a young tank, keeping them too cool, feeding too much and combining them with unsuitable tank mates.
Background and identification
Extra context helps you identify, compare and keep the species safely.
Caridina woltereckae is a Sulawesi shrimp associated with warm alkaline lake habitats. Its care should follow specialist Sulawesi lake conditions rather than standard dwarf shrimp care.
Harlequin shrimp are valued for distinctive contrasting patterning. Exact appearance can vary, and stress can make colors less clear.
Compared with Cardinal shrimp, Harlequin shrimp are usually considered at least as specialist and often less forgiving. Compared with Neocaridina, their water needs are completely different.
Full species profile
The Sulawesi Harlequin shrimp, Caridina woltereckae, is a rare and demanding Sulawesi shrimp with a distinctive pattern. It should be treated as a specialist species for experienced keepers, not as a general community shrimp.
Water and setup
Use warm alkaline Sulawesi-style water: roughly 27-30 degrees Celsius, pH 7.8-8.5 and stable mineralized RO water. Do not use active soil. Use an old, mature rocky aquarium with oxygen-rich flow, inert substrate and abundant biofilm.
Feeding and breeding
Harlequin shrimp graze biofilm and fine surface growth. Feed tiny controlled amounts of fine algae-based or shrimp food only as support. They can breed in freshwater, but stability and mature biofilm are critical.
Frequently asked questions
Short answers to common questions about Sulawesi Harlequin shrimp.
Sources and review
Last reviewed: June 15, 2026. Different values are used in the hobby; choose stability over chasing numbers.
Sources for accepted names, classification and synonyms.
Sources for water values, temperature and stable care.
Practical sources for setup, feeding, behavior and breeding.