The Ultimate Care Guide for Amano Shrimp in Planted Tanks

Quick answer: Amano shrimp (Caridina multidentata) are among the most useful freshwater shrimp for planted aquariums because they spend much of the day grazing algae, biofilm, leftover food, and other edible material from leaves, wood, rock, and glass. They are also larger and more assertive at feeding time than most dwarf shrimp. The easiest way to keep them successfully is to provide a fully cycled, mature aquarium with stable water chemistry, good oxygenation, gentle-to-moderate flow, plenty of grazing surfaces, a secure lid, and enough supplemental food that the shrimp do not have to survive on algae alone.

If you are building a planted aquarium and want a hardworking cleanup crew, you can browse our Amano Shrimp for sale. This guide covers the entire freshwater care picture: tank setup, water parameters, feeding, algae control, plants, filtration, molting, tank mates, acclimation, escape prevention, breeding reality, and long-term maintenance.

What are Amano shrimp?

Amano shrimp are a relatively large freshwater aquarium shrimp native to East Asia. They are often listed under the older scientific name Caridina japonica, but the currently accepted name is Caridina multidentata. Adults commonly reach roughly 1.5 to 2 inches, making them noticeably larger than most Cherry Shrimp and other Neocaridina. Their translucent gray-to-tan bodies are patterned with small dots or dashes along the sides, and mature females tend to become larger and fuller-bodied than males.

Their aquarium popularity is tied closely to planted-tank culture. Amano shrimp constantly pick at surfaces with their front appendages, which makes them excellent grazers in aquascapes where algae and biofilm develop on leaves, driftwood, stones, and equipment. They are not a replacement for correcting excessive light or nutrient imbalance, but they can be an extremely useful part of a balanced algae-management strategy.

Amano shrimp care at a glance

Choose a mature aquarium, not just a newly filled tank

The most important Amano shrimp requirement is not a specific piece of equipment—it is stability. Shrimp are exposed directly to the water around them, and abrupt changes in ammonia, nitrite, temperature, pH, hardness, or dissolved solids can create far more stress than small differences within an otherwise appropriate range. A tank should be completely cycled before Amano shrimp are added, with 0 ppm measurable ammonia and 0 ppm measurable nitrite.

A mature aquarium has an additional advantage: it has had time to grow the thin films of microorganisms, algae, and organic material that shrimp graze throughout the day. A tank can technically complete the nitrogen cycle before it looks biologically mature. For Amanos, especially when you want them to forage naturally, a little age is beneficial. Wood, rocks, plant leaves, and filter surfaces all become part of the food-producing habitat.

If your aquarium is still new, read our dedicated guide to cycling a tank for Amano shrimp and other algae eaters. Cycling and maturation deserve their own process; adding shrimp early because the tank already has visible brown algae is not a shortcut.

Tank size and stocking Amano shrimp

Amano shrimp have a relatively modest individual bioload, but they are active and appreciate room to forage. A 10-gallon or larger planted aquarium is an easy starting point for a small group because it provides more stable water volume and more surface area than a tiny container. Larger tanks also offer more driftwood, plants, rocks, and open substrate for grazing.

There is no strict requirement that Amano shrimp be kept in a large school, but keeping several makes their behavior more visible and creates a more effective grazing crew. Stock conservatively and remember that any fish, snails, or other shrimp in the aquarium also contribute to feeding pressure and waste production. The goal is not to fit the maximum possible number of animals into the tank—it is to maintain enough food, oxygen, and clean water for the entire community.

Water parameters: aim for a stable middle ground

Amano shrimp are more adaptable than many specialized bee shrimp, which is one reason they work so well in community planted tanks. Aquarium Co-Op lists a broad captive range of approximately 65–82°F and pH 6–8 with moderate-to-hard general hardness. That range should not be interpreted as a reason to move the shrimp back and forth between extremes. A stable aquarium in the upper 60s through mid-70s Fahrenheit with near-neutral water and adequate mineral content is a practical target for many homes.

General hardness (GH) matters because freshwater crustaceans require minerals as part of normal exoskeleton development and molting. Carbonate hardness (KH) affects buffering and pH stability. TDS can be useful as a consistency tool, but it does not tell you which dissolved substances are present, so it should not replace GH, KH, pH, ammonia, nitrite, and nitrate testing.

For exact parameter discussion, see our Amano shrimp water parameter guide covering temperature, pH, GH, KH, and TDS. When acclimating or changing water, preventing a sudden swing is generally more important than forcing the tank toward a supposedly perfect number in a single day.

Filtration, oxygen, and flow

Amano shrimp benefit from good oxygenation and dependable biological filtration. Sponge filters are especially useful in shrimp tanks because they provide a large colonized surface, create gentle water movement, and do not have a powerful intake that can trap small invertebrates. Hang-on-back and canister filters also work well when flow is appropriate and intakes are protected where necessary.

Research on Caridina multidentata published in the Journal of Crustacean Biology found a preference for current flow in experimental habitat-selection tests. That does not mean you should blast shrimp across the aquarium, but it supports what many keepers see in practice: Amanos are comfortable in well-oxygenated tanks with moving water. Surface agitation is especially important in warm, densely stocked, or heavily fertilized planted aquariums.

For a deeper comparison of equipment and temperature control, read Do Amano Shrimp Need a Heater and Filter in Their Tank?.

Plants, substrate, driftwood, and hardscape

Amano shrimp are at their best in an aquarium with a lot of usable surface area. Live plants are valuable not because the shrimp need a particular plant species, but because leaves and stems collect biofilm and tiny particles. Mosses create extremely dense grazing surfaces, while driftwood and textured stone provide additional places for algae and microorganisms to grow.

An inert sand or gravel substrate is perfectly suitable when your source water already has appropriate hardness and pH. Active aquasoils can also be used, but many are designed to lower KH and pH. That may be desirable for some specialized Caridina setups, yet it can create unnecessary chemistry changes in a general Amano tank. Test what the substrate actually does to your water instead of choosing based only on marketing.

If you are planning the physical layout, our Amano shrimp substrate and hardscape guide goes into more detail on sand, gravel, aquasoil, wood, stone, and grazing surface.

What should you feed Amano shrimp?

Amano shrimp are famous algae eaters, but they should not be expected to live on algae alone. They are opportunistic omnivorous scavengers. In a mature planted aquarium they will graze biofilm, soft algae, tiny organic particles, and leftovers, but a clean tank or a large Amano group may not produce enough natural food every day.

Offer small amounts of quality sinking food when natural grazing is limited. Shrimp wafers, algae wafers, quality bottom-feeder foods, and occasional blanched vegetables can all be useful. In community tanks, make sure food actually reaches the bottom. Amanos are bold enough to grab food from fish and other shrimp, but smaller dwarf shrimp can also be outcompeted if every meal is concentrated in one location.

The best feeding amount is based on observation. If food disappears rapidly and the shrimp resume grazing, the portion is probably reasonable. If chunks remain for hours and begin breaking down, reduce the next feeding. Overfeeding does not make Amanos healthier; it raises the organic load that the filter must process.

See what types of algae Amano shrimp actually eat and how to manage supplemental feeding without overfeeding for focused guides on those two topics.

How good are Amano shrimp at eating algae?

They are especially useful against soft films, filamentous growth, and many forms of hair or thread algae. They may pick at black beard algae under some conditions, particularly when it is young or weakened, but they are not guaranteed to erase every established patch. Hard green spot algae on glass and old leaves is generally a different challenge and is often handled better with scraping, snails, plant pruning, and correction of the conditions that produced it.

The key husbandry truth is simple: Amano shrimp are algae control helpers, not an algae cure. If a planted tank receives far more light than its plants can use, nutrients are badly imbalanced, or maintenance is neglected, a shrimp crew cannot permanently solve the underlying problem.

Molting: what a healthy molt looks like

Like all shrimp, Amanos grow by shedding their old exoskeleton. A clear, hollow shrimp-shaped shell on the substrate is usually normal and should not automatically be mistaken for a dead shrimp. Many keepers leave the molt in the aquarium because shrimp and snails may consume some of its mineral-rich material.

After molting, an Amano shrimp is soft and vulnerable. It may hide until the new exoskeleton hardens. Dense plants, wood, rock crevices, and moss provide valuable refuge during this period. Repeated failed molts are a reason to review GH, KH, diet, temperature, and the size and frequency of water changes instead of blindly adding calcium.

Our dedicated guides explain how often Amano shrimp molt and how to troubleshoot failed molts, mineral issues, and water instability.

Safe tank mates for Amano shrimp

Adult Amanos are larger than most dwarf shrimp, but they are still prey-sized animals to many fish. Peaceful nano fish and small community species are generally safer than large cichlids, puffers, aggressive barbs, or fish known to hunt crustaceans. Even a fish that cannot swallow an adult Amano whole may injure a newly molted shrimp.

Amanos can also live with Cherry Shrimp, Skittles Shrimp, and other dwarf shrimp when the water requirements overlap. They do not crossbreed with Neocaridina. The bigger practical issue is feeding competition: Amanos can carry away pellets and wafers, so spread food among several locations if smaller shrimp are missing meals.

Use our Amano shrimp tank-mate guide for fish choices, or see whether Amano shrimp can live with Cherry or Skittles shrimp if you want a mixed shrimp community.

Acclimating new Amano shrimp

Shipping water and aquarium water can differ in temperature, pH, hardness, and dissolved solids. Moving shrimp directly between very different conditions can create osmotic stress. A controlled acclimation lets the shrimp experience those changes gradually. Avoid leaving them for excessive periods in deteriorating shipping water, and do not pour a large volume of shipping water into the display tank.

Once introduced, dim the lights and give them time to explore. It is common for newly added Amanos to be unusually active at first. Persistent frantic swimming combined with poor posture, lethargy, loss of balance, or all shrimp attempting to leave the water should trigger immediate testing of ammonia, nitrite, temperature, and other basic parameters.

For the step-by-step process, use our Amano shrimp acclimation guide.

Amano shrimp can escape—use a lid

Amano shrimp are capable climbers. Airline tubing, filter pipes, cords, plant leaves, and silicone seams can give them access to the top of the aquarium. A tight-fitting lid is therefore useful, especially immediately after introduction or whenever equipment creates large openings around the back of the tank.

Escape attempts can also be information. One wandering shrimp does not necessarily mean the water is bad, but several shrimp suddenly gathering near the surface or trying to leave should prompt a water-quality check. Our guide Do Amano Shrimp Escape? explains how to cover common gaps without blocking normal gas exchange.

Can Amano shrimp breed in freshwater?

Adult Amano shrimp live very well in freshwater and females may carry large numbers of eggs there. The complication comes after hatching. Amano shrimp have an amphidromous life history: the tiny larvae require a saline phase before metamorphosing into juveniles that can return to freshwater. A 2021 laboratory study in Crustacean Research found C. multidentata larvae successfully adapted across a relatively broad salinity range in the higher-salinity treatments, reinforcing why normal freshwater shrimp-breeding methods do not work for this species.

This is very different from Cherry Shrimp, whose babies hatch as miniature freshwater shrimp. If breeding is your goal, do not convert the adult planted aquarium to brackish water. Keep the adults in freshwater and use a separate larval system. Start with our guides to why Amano larvae do not develop normally in freshwater and setting up a brackish Amano larval tank.

Weekly maintenance for a planted Amano shrimp tank

Good Amano care is mostly consistent routine. Observe the shrimp every day, remove obvious excess food, keep the filter running reliably, prune decaying plant material, and perform partial water changes based on stocking and nitrate accumulation. New water should be dechlorinated and reasonably close to the aquarium in temperature and mineral content.

Large emergency corrections can be necessary when ammonia or nitrite is present, but routine maintenance should not repeatedly swing the tank between very different chemistry. If you use fertilizers in a planted tank, dose them according to the product instructions rather than assuming that the word “copper” automatically makes a trace-element fertilizer lethal. Concentration matters; copper medications are a different risk category and require particular caution around invertebrates.

For maintenance, see our safe Amano shrimp water-change guide and fertilizer and copper safety guide.

Signs of healthy Amano shrimp

• Frequent grazing on plants, hardscape, substrate, or glass
• Strong grip and coordinated walking or swimming
• Normal translucent-to-gray coloration without rapidly spreading opaque tissue
• Regular successful molts with normal behavior afterward
• Active feeding without prolonged lethargy
• Occasional hiding after a molt, followed by a return to normal grazing

One behavior by itself rarely diagnoses a problem. Sudden changes affecting several shrimp at the same time are more meaningful. When something looks wrong, test the water before reaching for medication. Ammonia, nitrite, temperature, oxygenation, and recent changes should be checked first.

Frequently asked questions about Amano shrimp care

Are Amano shrimp good for beginners?

Yes. Their adaptability, larger adult size, and strong feeding response make them one of the more forgiving shrimp choices when the aquarium is fully cycled. They are not immune to ammonia, copper overdose, extreme parameter swings, or poor acclimation, so “beginner-friendly” should not be confused with indestructible.

How many Amano shrimp should I keep?

There is no mandatory school size. A small group of several shrimp works well in many planted aquariums, with the exact number determined by tank size, available food, filtration, and other livestock. If the tank is very clean, a large group will need more supplemental feeding.

Will Amano shrimp clean my entire tank?

They can substantially help with soft algae, biofilm, leftover food, and some filamentous algae, but they do not replace glass cleaning, pruning, water changes, or correcting excess light and nutrients. Think of them as part of the maintenance system, not the entire maintenance system.

Do Amano shrimp need a heater?

Not in every home. If the aquarium naturally stays within a stable, suitable temperature range, a heater may be unnecessary. If room temperature falls substantially or fluctuates, a thermostatic heater can improve stability.

Do Amano shrimp eat live plants?

Healthy aquarium plants are generally not their target. They spend their time scraping algae, biofilm, microorganisms, and soft decomposing material from plant surfaces. Damaged or dying plant tissue may be picked apart because it is easier to consume and often covered in microbial growth.

Why is my Amano shrimp hiding?

Hiding is common after a molt, after shipping, when lights are bright, or when fish make the shrimp feel exposed. Research has also documented light avoidance in experimental habitat selection. Give them shaded plant cover and hardscape rather than forcing them into open water.

Ready to add Amano shrimp to a planted tank?

If your aquarium is cycled, stable, and stocked with compatible animals, shop Amano Shrimp from Shrimp Up Aquatics. Plan the tank around long-term shrimp health first, then let their algae-grazing behavior become an added benefit rather than the only reason they are there.

Sources and further reading

• Aquarium Co-Op — Care Guide for Amano Shrimp
• Journal of Crustacean Biology — Habitat selection and copper toxicity in Caridina multidentata (2025)
• Crustacean Research — Larval performance of Caridina under different temperature and salinity conditions (2021)
• Aquarium Co-Op — The Fish Keeper’s Guide to pH, GH, and KH