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Sulawesi Harlequin Shrimp
Caridina spinata
Animalia›Arthropoda›Malacostraca›Atyidae
📍 Lake Matano & Lake Towuti, Sulawesi, Indonesia
Stunning white shrimp with deep blue or red spots. Endemic to ancient Sulawesi lakes with unique water chemistry. Requires warm, alkaline, hard water — a true specialist shrimp.
Care Guide
Diet
Sulawesi Harlequin Shrimp are omnivorous grazers that feed on biofilm, algae, and decaying plant matter. Supplement with high-quality shrimp pellets, blanched vegetables (spinach, zucchini), and occasional frozen foods like bloodworms or brine shrimp 2-3 times weekly. Ensure constant access to algae wafers and established biofilm in the tank.
Behavior
These shrimp are peaceful, slow-moving grazers that spend most of their time foraging on substrate and plants. They are social and should be kept in groups of at least 6 to reduce stress and encourage natural behavior. They are sensitive to disturbance and prefer dimly lit tanks with plenty of hiding spots.
Breeding
Breeding Sulawesi Harlequin Shrimp in captivity is extremely difficult and rarely successful in home aquariums. They require very specific water chemistry (high pH, hardness, and temperature stability) that is challenging to maintain consistently. Females are rarely observed producing viable offspring, making captive breeding nearly impossible for most hobbyists.
Tank Mates
Hardy plant that provides grazing surfaces and shelter without being uprooted by shrimp activity
Creates biofilm-rich surfaces for foraging and provides dense cover for security
Compatible algae eater with similar peaceful temperament; no competition for food sources
Can coexist but may compete for food; requires careful monitoring and ample space
Specialized plant that provides grazing substrate and shelter in a specialized aquarium setup
Common Diseases
Molting Stress Syndrome
Difficulty shedding exoskeleton, lethargy, loss of appetite, incomplete molts
Ensure stable water parameters (especially calcium and magnesium for shell hardening), maintain consistent temperature, and provide iodine-rich foods or supplements
Bacterial Infection
Cloudy appearance, lesions on body, discolored patches, lethargy
Perform 25% water changes, maintain pristine water quality, remove affected individuals to quarantine, and avoid overfeeding
pH Shock
Sudden inactivity, color fading, difficulty moving, death within hours
Prevent through acclimation and stable water chemistry; these shrimp cannot tolerate pH fluctuations below 7.5 or above 8.5
Parasitic Infection
Visible parasites on body, excessive grooming, lethargy, appetite loss
Quarantine affected shrimp, perform frequent water changes, maintain high water quality, and consider species-safe treatments if available
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