Amano Shrimp Care: The Best Algae-Eating Shrimp
Amano shrimp care guide: a 10 gallon tank, 65 to 80F, peaceful temperament, the best algae eater in the hobby, and why they cannot breed in freshwater.
Amano shrimp are the best algae eating shrimp in the freshwater hobby and need a cycled tank of at least 10 gallons kept between 65 and 80F. They are peaceful, grow to about 2 inches, and live 2 to 3 years. The one thing they will not do is breed in your tank: their larvae require brackish water to develop, so you will never get a freshwater population explosion.
Caridina multidentata, made famous by aquascaper Takashi Amano, earns its reputation as a workhorse cleanup crew that grazes hair and film algae and mops up leftover food. This guide covers the tank, water parameters, diet, tankmates, and health that keep amano shrimp thriving, plus an honest look at why breeding is an advanced project. If you are still planning your tank, size it with our minimum tank size calculator and confirm the real water volume with the aquarium volume calculator.
Amano shrimp care at a glance
| Care factor | Detail |
|---|---|
| Minimum tank size | 10 gallons |
| Adult size | About 2 inches |
| Temperature | 65 to 80F |
| pH | 6.5 to 7.5 |
| Hardness | Soft to moderately hard, roughly 6 to 12 dGH |
| Diet | Algae and biofilm grazer plus supplemental food |
| Temperament | Peaceful and active |
| Lifespan | About 2 to 3 years |
| Breeding | Will not breed in freshwater (larvae need brackish) |
| Best feature | Most effective algae eating shrimp |
Tank setup
Plan for at least 10 gallons. Amano shrimp are larger and far more active than cherry shrimp, so they need room to roam and enough algae and surface area to graze. A 10 gallon comfortably holds 3 to 5, and a larger planted tank can support more. As with any invertebrate, the tank must be fully cycled before they arrive, because shrimp are highly sensitive to ammonia and nitrite.
Filtration and flow
A sponge filter is an excellent choice because it is gentle, grows biofilm the shrimp graze, and poses no risk to the shrimp. Adult amano shrimp are too big to be sucked into most filters, so a hang on back or canister is fine as well, but fitting a pre filter sponge over the intake is still good practice. Amano shrimp enjoy moderate flow and well oxygenated water, so do not be afraid of gentle current.
Plants, substrate, and copper warning
Plants are the heart of an amano tank because they host the algae and biofilm that shrimp eat and give freshly molted shrimp a place to hide. Mosses, driftwood, and broad leaf plants all work well. Like all shrimp, amano shrimp are killed by copper, so never use copper based fish medications and read every label on fertilizers and treatments. Cycle the tank first by establishing the nitrogen cycle and letting the beneficial bacteria mature over about 4 to 6 weeks before adding livestock.
Water parameters
Amano shrimp are hardy across a wide range, with a target pH of 6.5 to 7.5 and soft to moderately hard water. They need some minerals, especially calcium, to molt successfully, so very soft, mineral poor water can cause failed molts. Check your GH and KH if molting problems appear. In a cycled tank your goals are 0 ppm ammonia, 0 ppm nitrite, and low nitrate. Always dechlorinate tap water, keep weekly water changes modest at 10 to 25 percent, and match temperature when refilling. Our water change guide walks through a low stress routine.
Diet
Amano shrimp are voracious algae eaters and will graze hair algae, film algae, and leftover food all day, which is exactly why aquascapers add them. The catch is that a clean, established tank often does not have enough algae to feed a group, so you must supplement. Offer sinking algae wafers, a quality shrimp food, blanched zucchini or spinach, and occasional protein. Feed small portions the group clears within a couple of hours, and never let uneaten food rot, since that triggers harmful ammonia spikes.
Amano shrimp tank essentials
Invert Aquatics Mini Algae Discs for Shrimp
$6.49 on Amazon
Quick sinking, spirulina rich discs sized for shrimp and bottom feeders.
AQUANEAT Sponge Filter 3 Pack (up to 10 Gal)
$6.98 on Amazon
Gentle bio filtration that grows biofilm and keeps water shrimp safe.
Ultra Fresh Shrimp Food High Protein
$9.49 on Amazon
Supplemental food for when grazing algae is not enough to feed the group.
Marcus Fish Tanks Java Moss Live Plant
$6.65 on Amazon
Hosts algae and biofilm and gives molting shrimp a safe place to hide.
Tankmates
Amano shrimp are peaceful and, thanks to their size, get along with a wider range of community fish than tiny shrimp do. Good companions include tetras, rasboras, danios, corydoras, otocinclus, peaceful gouramis, and snails such as nerites and mystery snails. Avoid large or aggressive fish like oscars, larger cichlids, goldfish, and anything with a mouth big enough to eat a shrimp. Provide plenty of cover so freshly molted, soft bodied shrimp can hide until their new shell hardens. Before adding fish, run the numbers with our stocking calculator to avoid overstocking.
Common problems and health
The leading dangers to amano shrimp are copper and unstable water. Copper based medications, some fertilizers, and old plumbing can all introduce trace copper that is fatal to invertebrates, so never dose a copper med in a shrimp tank and read every label. Failed molts, shown by a stuck shell or a white ring around the body, usually trace to a mineral shortage or a sudden parameter swing, so verify your GH and keep changes gradual. Ammonia spikes from overfeeding or an incomplete cycle stress and kill shrimp fast. A healthy amano shrimp is active and constantly grazing, so lethargy is an early warning to test your water. For persistent issues, ask a knowledgeable local fish store. This guide is educational, not a substitute for professional advice.
Breeding
Here is the honest truth: you almost certainly will not breed amano shrimp in a normal tank. Females carry eggs and will release larvae, but those larvae must drift into brackish or saltwater to develop, then migrate back to fresh water as juveniles. In a freshwater aquarium the larvae die within a few days. Breeding them is an advanced, multi stage project that requires a separate brackish larval tank, careful salinity control, and patience. For nearly every keeper, the practical approach is to enjoy amano shrimp as a long lived cleanup crew and replace them as needed.
The bottom line
If you want the most effective algae eating shrimp for a planted community tank, amano shrimp are the top choice: hardy, peaceful, big enough to dodge most fish, and tireless grazers. Give them a cycled 10 gallon or larger tank, stable mineralized water, supplemental food once the algae thins out, and zero copper, and they will earn their keep for years. Plan with the minimum tank size calculator, confirm volume with the aquarium volume calculator, and keep your community balanced using the stocking calculator.
Aquarium Setup & Maintenance Planner
Stocking planner, water-test log, cycling tracker, maintenance schedule, and more, in one printable planner that keeps your tank on track.
Frequently Asked Questions
Are amano shrimp really the best algae eaters?
Among freshwater shrimp, yes. Amano shrimp are widely regarded as the most effective algae eating shrimp in the hobby because they are larger, more active, and eat more than the small Neocaridina species. They graze hair algae, soft film algae, and leftover food aggressively, which is why planted tank keepers prize them. They will not clear every algae type, especially stubborn black beard or blue green algae, but they are the strongest shrimp option for a cleanup crew.
Why will amano shrimp not breed in my tank?
Amano shrimp have a complex life cycle that freshwater tanks cannot complete. Females release larvae that must drift into brackish or saltwater to develop, then return to fresh water as juveniles. In a normal freshwater aquarium the larvae die within days, so you will not get a population boom the way you do with cherry shrimp. Breeding them is an advanced project that requires a dedicated brackish larval setup, so most keepers simply buy replacements.
How many amano shrimp should I keep?
A common guideline is roughly one amano shrimp per 2 to 5 gallons, scaled to how much algae and surface area your tank has. A 10 gallon tank comfortably holds 3 to 5, while a heavily planted 20 gallon can support more. They are social and forage better in a small group, so keep at least three. If you stock too many for the available algae, plan to supplement their diet so they stay well fed.
Do amano shrimp need a heater?
Often not, but it depends on your room. Amano shrimp do well across a broad 65 to 80F range, so many homes stay warm enough year round. If your room drops into the low 60s or swings sharply between day and night, a small adjustable heater adds the stability they prefer. As with all shrimp, steady conditions matter more than hitting one exact temperature, so avoid rapid changes when topping off or changing water.
What do amano shrimp eat once the algae is gone?
Amano shrimp are big eaters, so an algae free tank cannot sustain a group on its own. Supplement with sinking algae wafers, a quality shrimp food, blanched vegetables such as zucchini or spinach, and the occasional protein treat. Watch their behavior: shrimp that constantly swim and scavenge the substrate are usually hungry. Feed small amounts they finish within a couple of hours, and remove leftovers so the water stays clean.
Are amano shrimp safe with fish?
Generally yes. Adult amano shrimp are large enough, about 2 inches, that most community fish leave them alone, which is an advantage over tiny cherry shrimp. They are peaceful and will not bother tankmates. Still avoid large or aggressive fish like big cichlids, goldfish, and anything that could fit a shrimp in its mouth. Provide cover such as plants and driftwood so freshly molted, soft shrimp have somewhere safe to hide.
Planning or running a tank?
Use our free calculators and guides to get every number right.
Aquarium Planner: $39