Amano Shrimp Care Guide: The Best Algae Eater for Freshwater Tanks

Amano Shrimp Care Guide: The Best Algae Eater for Freshwater Tanks

Introduction

Amano Shrimp (Caridina multidentata and related species) are celebrated as the most effective algae-eating shrimp in the freshwater hobby. Named after legendary aquarist Takashi Amano, who pioneered their use in nature aquariums, these shrimp will voraciously consume hair algae, thread algae, and soft green algae that most other cleaners ignore.

At Concrete Blonde Aquatics, we stock several Amano variants to suit different tastes and tank setups, including the classic Amano Spotted / Yamato Shrimp, the rare Australian Amano Shrimp, and stunning colour morphs like the Sun Orange and Lemon Yellow Amano Shrimp.

Quick Stats

  • Scientific name: Caridina multidentata / Caridina japonica
  • Adult size: 3.5–5 cm (1.5–2 in); females larger than males
  • Lifespan: 2–3 years (up to 5 in optimal conditions)
  • Minimum tank size: 40 L (10 gal)
  • Temperament: Peaceful, active
  • Difficulty: Beginner to intermediate

Water Parameters

Amano Shrimp are more adaptable than most Caridina species, but they still prefer soft, slightly acidic to neutral water. Avoid ammonia spikes and sudden parameter swings — shrimp are far more sensitive than fish.

  • Temperature: 18–28°C (64–82°F); ideal 22–26°C
  • pH: 6.5–7.5
  • Hardness (GH): 4–12 dGH
  • TDS: 100–250 ppm
  • Ammonia / Nitrite: 0 ppm (critical)
  • Nitrate: < 20 ppm
  • Copper: 0 (lethal to all shrimp — avoid copper-based medications)

Tank Setup

Amano Shrimp thrive in planted tanks where they have biofilm, algae, and plant matter to graze on constantly. A mature, cycled tank is essential before adding shrimp.

  • Substrate: Aquasoil or fine sand — they will forage across the entire bottom
  • Plants: Dense planting encourages biofilm growth; Java moss, anubias, and ferns are ideal
  • Cover: Driftwood and rocks provide hiding spots, especially post-moult when they are temporarily vulnerable
  • Filtration: Sponge filter or HOB with pre-filter sponge — shrimp can be sucked into intakes
  • Lid: Amanos are escape artists; a tight-fitting lid is mandatory

Algae Control

A single Amano Shrimp can consume impressive quantities of algae. For effective control in a planted tank:

  • Stock at a rate of 1 shrimp per 4–6 litres for active algae issues
  • For maintenance in a clean tank, 1 per 10 litres is sufficient
  • They excel against hair algae, staghorn algae, and thread algae — but will not eat black beard algae (BBA) effectively

Feeding

In a mature planted tank, Amanos graze continuously on algae and biofilm. Supplement when algae is sparse:

  • Blanched vegetables: zucchini, spinach, or cucumber (2–3x per week)
  • Sinking algae wafers or shrimp-specific pellets
  • Remove uneaten food within 24 hours to prevent water quality decline

Tank Mates

Amano Shrimp are peaceful but large enough to avoid being eaten by most community fish — a key advantage over smaller Neocaridina shrimp.

  • Compatible: Neon Tetras (including classic, Green, and Black), Corydoras, Otocinclus, small rasboras, danios
  • Avoid: Cichlids, large gouramis, loaches (many eat shrimp), goldfish, and any fish large enough to engulf a 4 cm shrimp

Moulting

Shrimp shed their exoskeleton as they grow — typically every 4–6 weeks. During and immediately after a moult, Amanos are soft and vulnerable. Do not remove shed exoskeletons; they are consumed for calcium. Provide hiding spots so recently moulted shrimp can recover safely.

Failed moults are usually caused by low GH (insufficient minerals), high nitrates, or parameter instability. If moulting deaths become frequent, test your GH and consider a mineral supplement.

Breeding

Amano Shrimp are extremely difficult to breed in home aquariums — their larvae require brackish water to develop, a process that is challenging to replicate. Most hobbyists purchase rather than breed them. Don’t expect spontaneous colony growth like you would with Cherry Shrimp.

Our Amano Shrimp Collection

We offer several unique variants beyond the standard wild-type:

Browse our Freshwater Fish collection to find compatible tank mates for a complete community setup.

Stock is updated regularly. Questions about compatibility or availability? Reach out e-mail or visit us in Winnipeg.

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