Blue Red Rili (Blue Razz) shrimp and Amano shrimp can often share a mature planted freshwater aquarium, but they do not play identical roles in it. Amanos are noticeably larger, powerful grazers and fast at taking sinking food, while Blue Razz are smaller Neocaridina that may be raising tiny offspring in moss. A peaceful pairing can still be difficult if one food pellet attracts every animal and the Amanos carry it away. This guide focuses on the practical differences between the two shrimp, how to allocate feeding areas and when a dedicated Blue Razz nursery is preferable to a shared display.
Amano and Blue Razz are different shrimp species
Blue Razz is a selected form of Neocaridina davidi. The common Amano algae cleaner is Caridina multidentata, a different shrimp species with different body size, feeding style and larval development. Do not confuse a typical Amano with soft-water crystal or Taiwan Bee Caridina just because they share a genus; their aquarium care is not interchangeable. An adult Amano often appears much larger and more assertive at a food dish than a dwarf Neocaridina. That difference is not automatically aggression or hunting. Both are active foragers, and both can be interesting in a planted display where their normal temperature, mineral and dietary needs overlap. The decision to house them together should be based on actual tank size, food access and the fate of the smallest offspring, not only on taxonomy.
Do they interbreed or dilute a Blue Razz color line?
Amano shrimp and Neocaridina do not produce hybrid offspring together. The presence of a correctly identified Amano therefore does not dilute Blue Razz red-and-blue lineage through crossbreeding. This differs from adding another Neocaridina color morph, such as solid-blue or Red Cherry, which can produce mixed-line young with Blue Razz breeders. Do not confuse the sight of two shrimp species sharing a pellet with mating. A berried Blue Razz female can hatch tiny freshwater shrimplets; a berried Amano female releases larvae with different rearing needs. Keeping Amanos in the same display does not mean you will establish a self-replenishing Amano population. For detailed mixed-Neocaridina crosses, see the Blue Velvet experimental crossing guide.
Where the pairing usually works: a mature planted display
A larger, stable planted aquarium with abundant established algae and biofilm gives both types of shrimp room to feed and retreat. Fine moss, broad leaves, safe wood and neutral hardscape provide multiple surfaces rather than one exposed shared wafer. Plan water volume around the adult Amanos' eventual size and the number of animals you intend to maintain; adding several large shrimp to a one-gallon ornamental jar is not the same as adding them to a spacious planted display. Confirm that the filter is mature, that ammonia and nitrite are consistently zero, and that there is enough oxygen and circulation. Both shrimp species benefit from plant cover during vulnerable molts, and a secure lid is especially important because Amanos can climb around openings near airline tubing and cables.
Food competition is the biggest day-to-day concern
Amanos readily seize large sinking pellets and may carry them away from smaller Neocaridina. A Blue Razz that backs away from a wafer has not necessarily been attacked, but it may lose access to a substantial part of the prepared ration. Watch how food is distributed over several feeding periods rather than assuming that everything disappearing overnight means every inhabitant ate well. Place an appropriately sized piece of food near Amano foraging space and smaller measured portions in sheltered shrimp-grazing areas; allow biofilm-rich moss and sponge surfaces to provide another continuous food source. Avoid doubling the total ration to compensate for one stolen pellet. Excess prepared food can damage water quality and make a nominally peaceful pairing dangerous through waste buildup rather than direct conflict.
Can large Amanos injure or eat healthy Blue Razz?
Amanos are generally maintained as peaceful invertebrate companions with adult Neocaridina, not as specialized shrimp predators. An individual may jostle, climb across or displace a smaller shrimp while reaching food, however, and opportunistic scavenging of an already deceased or weak animal should not be mistaken for proof of deliberate hunting. Avoid absolute promises about every interaction, especially immediately after a molt when a shrimp's new cuticle is soft. Observe whether Blue Razz adults continue to graze openly or spend all day avoiding a shared feeding location. If persistent chasing, unexplained injuries or repeated exclusion occur, move the animals into separate mature aquariums rather than waiting for a dramatic injury to settle the compatibility question. Proper nutrition and room usually matter more than trying to train an Amano not to be fast.
Keep your blue-and-red colony in a mature, stable aquarium.
Shop Blue Razz ShrimpBaby Blue Razz require extra planning in a mixed display
A dedicated bicolor breeding tank may contain numerous tiny newborns that spend their first days on moss and filter surfaces. Even if a mature Amano does not hunt healthy juveniles, its larger body and appetite increase competition for the same edible surface films and prepared food. There are anecdotal observations of Amanos interacting with small or weak shrimp, but these do not demonstrate a predictable juvenile-survival outcome for every colony. If you need to track each young Blue Razz until its red and blue regions develop, use a separate fish-free and Amano-free nursery for the most controlled observation environment. The shrimplet development guide
Check the real water and temperature overlap
Our Blue Razz store lists holding-system values around pH 7.0–7.8, GH 7–8 dGH, KH 3–4 dKH, TDS 200–250 ppm and 65–74°F. These describe the source stock, not universal preferred values for all crustaceans. Amanos are frequently kept across a broad range of freshwater conditions, but the actual origin and condition of your purchased individuals still matter. Compare the two groups' water before introduction and choose a stable overlap rather than changing pH or temperature suddenly to fit a generic compatibility chart. Test GH and KH directly; a TDS number does not establish the full mineral balance. Do not use salt in the Blue Razz display because you heard that Amano larvae require brackish rearing; adult cohabitation and larval culture are separate goals.
Amanos cannot complete their usual life cycle in this freshwater tank
Female Amanos may carry many eggs while living in freshwater, but their larvae do not follow the direct freshwater hatchling development of Neocaridina davidi. They require a distinct brackish-to-marine larval rearing strategy and cannot normally establish a self-sustaining population in an ordinary Blue Razz display. You do not need to add salt to a healthy Neocaridina aquarium because an Amano is berried, and doing so without a purpose-built larval system can destabilize the livestock you already have. A Blue Razz female's small freshwater shrimplets are a separate nursery concern. Monitor which animal is carrying eggs and maintain the freshwater habitat for the animals you actually intend to raise in that tank.
Introduce Amanos gradually and reassess the result
Quarantine or observe new shrimp as appropriate, and make sure they are correctly identified rather than mixing unknown invertebrates into a selected line. Acclimate to a mature, suitably sized planted aquarium with protected intake and enough forage. Add animals gradually, then observe who reaches food, whether Blue Razz remain active, and whether newly molted shrimp can retreat. Recheck ammonia and nitrite after increasing livestock and feeding. If keeping patterned offspring is the priority, preserve a dedicated line-breeding tank apart from the shared display even when the adult pairing behaves peacefully. For general low-risk companions that do not interbreed with Blue Razz, compare the nano fish caution guide and remember that fish predation adds a different risk from Amano food competition.
Blue Razz Aquarium Checklist
- Confirm the shrimp species rather than relying on trade names
- Use a mature suitably sized planted aquarium and tight-fitting lid
- Provide multiple feeding areas and monitor smaller shrimp
- Keep a separate nursery if Blue Razz juvenile survival is the priority
- Do not add salt to the Neocaridina display for Amano eggs
Frequently Asked Questions
Can Blue Razz and Amano shrimp live together?
Often yes in a mature appropriately sized freshwater aquarium with suitable water and enough food, but individual interactions and competition should be monitored.
Will Amanos crossbreed with Blue Red Rili Neocaridina?
No. Amano shrimp are Caridina multidentata and do not hybridize with the usual Neocaridina davidi Blue Razz color form.
Do I need to add salt when an Amano carries eggs?
No. Keep the Blue Razz freshwater display stable; raising Amano larvae requires a separate specialized brackish-to-marine rearing system.
Should I keep large Amanos in a Blue Razz breeder nursery?
A separate Amano-free nursery offers more controlled access to food and easier tracking of tiny patterned offspring.