Sulawesi Harlequin Shrimp

Caridina spongicola, the Harlequin Shrimp, is one of the most ornately patterned freshwater shrimp in existence, bearing a complex mosaic of white, red, and black colouration across its small body. In nature it associates closely with freshwater sponges in Sulawesi lake caves. It is among the most demanding Sulawesi species due to its very specific warm, alkaline, hard water requirements and sensitivity to nitrates. Breeding is rare in captivity.

Water: 27–30°C, pH 7.8–8.5, TDS 250–350, GH 10–15, KH 5–8; pristine Sulawesi parameters. Tank: minimum 30 L, rock caves, smooth pebbles, minimal flow, sponge filter. Feeding: biofilm; supplement with powdered coral shrimp food and soft algae. Behaviour: extremely peaceful; cryptic; found near rocks and cave entrances. Compatibility: Sulawesi species-only tank; no fish whatsoever.