Amano Shrimp Colony

Caridina multidentata, commonly known as the Amano Shrimp after the legendary aquascaper Takashi Amano who popularised their use, are the gold standard for biological algae control in planted aquaria. Reaching 4–5 cm, they are significantly larger than Neocaridina species and are notably more aggressive algae grazers, consuming filamentous algae, hair algae, and green spot algae that smaller shrimp cannot effectively control.

This colony of 15 adults provides immediate algae-control impact in tanks from 40 L to 200 L, depending on algae load. The colony works continuously during daylight hours, roaming every surface of the aquarium and methodically grazing algae from leaves, substrate, hardscape, and glass. Their translucent body with a characteristic line of spots along the sides makes them attractive in their own right.

Amano Shrimp require good water quality and are less tolerant of ammonia spikes and pollutants than Neocaridina. They cannot be bred in freshwater as their larvae require a marine larval stage. However, as long-lived shrimp (up to 3 years), a colony of 15 will remain effective for years with proper care.

Water: 18–27°C, pH 6.5–7.5, GH 4–14, KH 1–8; clean water essential; sensitive to pollutants. Tank: minimum 40 L, planted or hardscape aquarium, moderate flow, no copper-based medications. Feeding: primary algae grazers; supplement with algae wafers and blanched vegetables when algae low. Breeding: marine larvae — captive breeding not possible in freshwater; replenish colony as needed. Compatibility: plant-safe; avoid fish over 6 cm that may predate; safe with snails and small fish.