Amano Shrimp Care: Tank Mates, Diet, and Algae-Eating Benefits
Photo by christina cahalane on Openverse (CC BY 2.0)
Amano shrimp (Caridina multidentata) are widely considered the most effective algae-eating shrimp in the freshwater hobby, growing to a relatively large 1.5-2 inches and tackling hair algae and algae mats that smaller shrimp species can't manage, though their larvae need brackish water to develop, so they almost never breed successfully in an ordinary home aquarium.
Key Takeaways
- Amano shrimp grow to 1.5-2 inches, noticeably larger than cherry or ghost shrimp, which is part of why they handle tougher algae like hair algae.
- They're peaceful scavengers that also clean up leftover food and biofilm, not just algae.
- Amano shrimp larvae require brackish or full-strength saltwater to complete metamorphosis, which is why breeding them in a freshwater community tank essentially never works.
- Like most invertebrates, amano shrimp are highly sensitive to copper-based medications and need a fully cycled, stable tank.
- Temperature tolerance runs roughly 65-80°F, and they generally do better on the cooler side of that range rather than in a heavily heated tropical tank.
| Attribute | Amano Shrimp |
|---|---|
| Care Level | Easy |
| Tank Size | 10 gallons minimum |
| Temperature | 65-80°F |
| pH | 6.5-7.5 |
| Diet | Algae, biofilm, algae wafers, blanched vegetables |
| Lifespan | 2-3 years |
| Temperament | Peaceful scavenger |
What Do Amano Shrimp Eat, and How Good Are They at Controlling Algae?
Amano shrimp eat algae, biofilm, and leftover fish food, and they're genuinely one of the best algae-eating shrimp available to freshwater keepers. Their larger size compared to cherry or bee shrimp lets them tear into hair algae and algae mats that smaller shrimp mostly ignore, which is why they're such a common recommendation for tanks fighting a stubborn algae problem. Beyond hair algae, amano shrimp will also graze on green spot algae, diatoms, and general algae film on glass, rocks, and driftwood, making them a genuinely versatile cleanup crew member rather than a one-trick specialist.
That said, amano shrimp aren't a substitute for fixing the underlying cause of an algae outbreak, usually excess light or nutrients. Once algae supply runs low in a well-maintained tank, supplement their diet with algae wafers or blanched vegetables like zucchini or spinach so they don't go hungry. For broader algae-control strategies beyond stocking shrimp, see our guide on getting rid of green algae.
What Water Parameters Do Amano Shrimp Need?
Amano shrimp do best in water with a temperature of roughly 65-80°F and a pH between 6.5 and 7.5, and they're more tolerant of moderate hardness than sensitive species like cherry shrimp. They don't need soft, acidic water to thrive, which makes them a more forgiving choice for keepers whose tap water runs on the harder or more neutral side.
Stability matters more than hitting an exact number. Amano shrimp are sensitive to sudden swings in parameters, so a tank should be fully cycled with an established bacteria colony before shrimp go in, since new tank syndrome is a common cause of early invertebrate losses.
Because amano shrimp are sensitive to sudden parameter shifts, drip acclimating new arrivals over 30-60 minutes rather than a quick float-and-dump greatly improves survival, especially if the shrimp are coming from water with a different hardness or pH than your tank.
Choosing Tank Mates for Amano Shrimp
Amano shrimp do well with small, peaceful fish that won't view a 1.5-2 inch shrimp as food, along with other invertebrates like snails and smaller shrimp species. Small schooling fish like rasboras and tetras, along with peaceful bottom dwellers like corydoras, are common, reliable companions that leave adult amano shrimp alone entirely. Their larger adult size actually gives them an advantage many dwarf shrimp don't have, since amano shrimp are big enough that most community fish leave adults alone, though newly molted shrimp are more vulnerable until their shell hardens.
Avoid pairing amano shrimp with larger or more aggressive fish, cichlids, or anything known to eat invertebrates. If you're building out a dedicated shrimp community and want a broader list of compatible species, our roundup of freshwater aquarium shrimp is a useful starting point for stocking decisions.
Why Amano Shrimp Almost Never Breed in a Home Aquarium
Amano shrimp (Caridina multidentata) are notoriously difficult to breed in captivity because their larvae hatch as tiny planktonic zoea that require brackish or full-strength saltwater to complete metamorphosis into recognizable juvenile shrimp. In an ordinary freshwater tank, females can carry and release eggs just fine, but the larvae simply can't develop in freshwater and die off within days of hatching.
This is different from many popular dwarf shrimp, like cherry shrimp, which hatch as fully formed miniature adults and breed readily in freshwater. If you specifically want a shrimp species that breeds easily in a community tank, look at cherry shrimp and their water needs instead, since amano shrimp reproduction requires dedicated brackish-water rearing setups that go well beyond typical home aquarium care.
Common Amano Shrimp Care Mistakes
The most damaging mistake is dosing a tank with copper-based medication while amano shrimp are present. Like nearly all aquarium invertebrates, amano shrimp have little tolerance for copper, and even doses considered safe for fish can be lethal to shrimp. Always check medication labels and consider a separate treatment tank for fish that need copper-based treatment. See our overview of common shrimp diseases for symptoms worth watching for.
Other frequent mistakes include adding shrimp to a tank that isn't fully cycled, letting algae supply run out without offering supplemental food, and assuming warmer is always better. Amano shrimp generally do better on the cooler end of their range rather than in a heavily heated tropical setup shared with fish that need 82°F-plus water. Handling shrimp directly with bare hands can also transfer soap, lotion, or oil residue that irritates their exposed gills, so use a net or a clean, wet hand whenever you need to move one between tanks.
Frequently asked questions
How many amano shrimp should I add to control algae?+
A common starting point is roughly one to two amano shrimp per 5-10 gallons of tank, adjusted based on how much algae is actually present. Adding too many into a tank with little algae left just means supplementing their diet more heavily with wafers or vegetables, so match the number to the size of the algae problem you're solving.
Can amano shrimp live with betta fish?+
Amano shrimp can often live with betta fish because their larger adult size makes them less appealing as prey than tiny dwarf shrimp, though individual bettas vary and some will still harass or nip at shrimp. Providing plenty of plants and hiding spots reduces the risk, but there's no guarantee with any individual betta's temperament.
Do amano shrimp eat black beard algae?+
Amano shrimp will pick at black beard algae and can help slow its spread, but they're generally not considered a reliable standalone solution for an established black beard algae outbreak the way they are for softer algae types. Combining them with other control methods gives better results than relying on amano shrimp alone.
Why did my amano shrimp turn white or die after molting?+
A shrimp that looks pale, turns white, or dies shortly after molting is often a sign of a failed molt caused by unstable water parameters, calcium or mineral deficiency, or a tank that isn't fully cycled. Molting is a vulnerable period for all shrimp, so keeping parameters stable and consistent is the best way to prevent molt-related deaths.
Do amano shrimp need a heater?+
Amano shrimp tolerate a fairly wide temperature range of roughly 65-80°F and don't strictly require a heater in a room that stays within that range, though stability matters more than the exact number. In a tank shared with tropical fish that need consistent warmth, a heater set toward the lower-middle of the amano shrimp's comfortable range works well for both.
Related guides
Are Pea Crabs Harmful to Humans?
Pea crabs are completely harmless to humans and safe to eat, even if you discover one in your oyster or clam. These tiny parasitic crustaceans are actually a sign of fresh seafood and pose zero health or toxicity risks.
Photo by Oliver Trottier and Andrew G. Jeffs on Openverse (CC BY 4.0)
