Introduction Amano shrimp (Caridina multidentata) are one of the most popular freshwater invertebrates in the aquarium hobby — and for good reason. Originally collected from Japan and Taiwan, these hardy algae-eaters are prized for their tireless work ethic, peaceful temperament, and striking appearance. Whether you're a beginner or a seasoned aquarist, this guide covers everything you need to set up a thriving Amano shrimp tank. Species Overview Scientific Name: Caridina multidentata (formerly Caridina japonica) Common Names: Amano Shrimp, Yamato Shrimp, Japanese Marsh Shrimp Adult Size: 1.5–2 inches (3.8–5 cm) Lifespan: 2–3 years (up to 5 years in optimal conditions) Difficulty: Beginner-friendly Temperament: Peaceful, active Aquarium Setup Tank Size A minimum of 10 gallons is recommended for a small group of 6–10 Amano shrimp. Larger tanks (20+ gallons) provide more stable water parameters and room for a community setup. Amanos are social and do best in groups — a lone shrimp will be stressed and less active. Water Parameters Temperature: 65–80°F (18–27°C) — optimal around 72–76°F pH: 6.5–7.5 Hardness (GH): 6–8 dGH Hardness (KH): 2–6 dKH Ammonia / Nitrite: 0 ppm (non-negotiable) Nitrate: Below 20 ppm Amano shrimp are more tolerant of water parameter fluctuations than dwarf shrimp species like Neocaridina or Crystal Red Shrimp, but they still require a stable environment before being added to an aquarium. Filtration Use a sponge filter or a HOB filter with a pre-filter sponge over the intake. Amano shrimp can be sucked into unprotected intakes. Sponge filters also provide a surface for biofilm, which shrimp love to graze on. Aim for gentle to moderate flow; strong currents can stress shrimp. Substrate Fine gravel, sand, or planted aquarium soil all work well. Dark substrates tend to bring out their natural coloration and reduce stress. Plants and Hardscape Amano shrimp thrive in planted tanks. Dense vegetation provides: Hiding spots during molting (a vulnerable period) Biofilm and algae growth for grazing Improved water quality through nutrient uptake Great plant choices include Java Moss, Anubias, Java Fern, Hornwort, and Cryptocoryne species. Driftwood and rocks add surface area for biofilm and create a natural aesthetic. Lighting Moderate lighting (6–8 hours per day) supports plant growth and encourages natural algae and biofilm growth — a key food source for Amano Shrimp. Diet and Feeding Amano shrimp are omnivorous scavengers and exceptional algae eaters. They consume: Soft algae (hair algae, thread algae, green dust algae) Biofilm on plants, glass, and hardscape Decaying plant matter Supplemental foods: algae wafers, blanched vegetables (zucchini, spinach), shrimp pellets, and spirulina-based foods Feed supplementally 2–3 times per week. Remove uneaten food within 24 hours to prevent ammonia spikes. Overfeeding reduces their motivation to eat algae — one of their most valuable traits. Molting Like all crustaceans, Amano shrimp molt (shed their exoskeleton) as they grow. Signs of an upcoming molt include reduced activity and hiding. After molting, shrimp are soft and vulnerable for 24–48 hours — ensure plenty of hiding spots. Do not remove the shed exoskeleton; shrimp will eat it to reclaim minerals. Ensure adequate calcium and magnesium in the water (via GH) to support healthy molting. Iodine supplements can also be beneficial. Compatible Tank Mates Amano shrimp are peaceful and do well in community tanks, but tank mate selection is critical. Their larger size (compared to dwarf shrimp) makes them compatible with a wider range of fish. Excellent Tank Mates Small tetras — Ember Tetras, Neon Tetras, Cardinal Tetras, Rummy Nose Tetras Rasboras — Harlequin Rasboras, Chili Rasboras, Lambchop Rasboras Corydoras catfish Otocinclus catfish — Peaceful algae eaters that coexist perfectly Dwarf shrimp — Neocaridina (Cherry Shrimp) and other Caridina species Snails — Nerite snails, Mystery snails, Ramshorn snails Celestial Pearl Danios — Small, peaceful, and visually stunning Endlers Livebearers — Tiny and non-aggressive Tank Mates to Avoid Cichlids — Most cichlids (including Angelfish) will eat or harass shrimp Bettas — Individual temperament varies, some bettas tolerate Amano Shrimp Goldfish — Will eat shrimp and require very different water parameters Large barbs — Tiger Barbs and similar species are fin-nippers and shrimp predators Large Loaches — Clown Loaches and similar species prey on invertebrates Crayfish and large crabs — Will catch and eat shrimp Pro Tip: The "Mouth Size" Rule A good general rule: if a fish can fit an Amano shrimp in its mouth, it's a risk. Amanos are larger than most dwarf shrimp, but adult fish with wide mouths can still consume them — especially during feeding frenzies or at night. Common Health Issues Failed molts: Usually caused by low GH (insufficient minerals). Supplement with a GH booster if needed. Copper toxicity: Amano shrimp are extremely sensitive to copper. Avoid any medications, fertilizers, or tap water conditioners containing copper. Ammonia/nitrite spikes: Always use a fully cycled tank and perform regular water changes (10–20% weekly). Jumping: Amanos are known escape artists. Use a tight-fitting lid or lower the water level slightly. Quick Care Summary Tank size: 10+ gallons Temperature: 65–80°F pH: 6.5–7.5 Diet: Algae, biofilm, supplemental shrimp foods Tank mates: Small peaceful fish, snails, dwarf shrimp Avoid: Copper, aggressive fish, uncycled tanks Breeding: Difficult — requires brackish larval stage Conclusion Thank you for reading our guide to Amano Shrimp. 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