Neocaridina denticulata

Choose this small freshwater shrimp for a carefully maintained aquarium

Neocaridina denticulata is a small freshwater shrimp in the family Atyidae. WoRMS recognises the species as Neocaridina denticulata, while Wikipedia describes Neocaridina as a genus of small, land-locked freshwater shrimp native to East Asia. It suits a keeper who can prepare a mature, filtered aquarium, test the water every week and protect small shrimp from fish that could eat them.

Plan its home around stable water quality rather than the shrimp’s compact arrival size. Keep the aquarium at 17–27°C, pH 6.5–8.0 and 4–18°dH. OATA’s freshwater shrimp and snail guidance gives these values for the group; they are not a species-specific optimum. It also recommends at least 10 litres for a group of small freshwater shrimp, with a larger aquarium when fish share the space.

A filter is essential, and the aquarium should contain gravel or sand together with plants, ornaments or caves that provide cover. A larger volume is useful because temperature and water quality tend to remain more stable. Before adding the shrimp, confirm that ammonia and nitrite are both zero and that the biological filter is ready to process additional waste.

If those conditions fit your aquarium, this shrimp offers grazing activity at a small scale without removing the need for deliberate feeding, filtration and weekly maintenance.

Understand the animal and the offer before ordering

One purchase supplies one live Neocaridina denticulata. The dispatch grade is 1–1.5 cm; use that measurement to anticipate the shrimp’s scale on arrival, not as a mature-size ceiling. Plan the aquarium around the group-space, water-quality and compatibility rules instead of treating a dispatch measurement as the final size.

Sex is guaranteed only when the selected option explicitly states male or female. This Neocaridina denticulata listing has no sex-guaranteed option.

Some gallery images have been digitally enhanced to improve image quality. They show the listed type of animal rather than guaranteeing the exact markings of the individual supplied, so natural colour and pattern can vary.

What to decide before purchase

• Water: confirm that the aquarium remains within 17–27°C, pH 6.5–8.0 and 4–18°dH.
• Filtration: use a mature biological filter and check ammonia and nitrite are both zero.
• Space: start from at least 10 litres for a group of small freshwater shrimp and increase the aquarium size when fish are included.
• Social planning: plan for shrimp as social animals and increase their number gradually rather than placing a large group into the aquarium at once.
• Compatibility: exclude predatory fish and any fish large enough to fit the shrimp in its mouth.
• Treatments: check every treatment for invertebrate safety because freshwater shrimp are highly sensitive to copper.

The single sold unit lets you decide how many animals the aquarium can support, but the biological filter must be given time to respond whenever livestock and feeding increase. The appropriate total depends on the aquarium’s volume, existing inhabitants and measured water quality, not on the purchase unit alone.

For related colour forms and identities, browse the cherry shrimp collection. Treat each product identity separately when comparing appearance or care, and do not assume that an image of several shrimp changes the one-animal purchase unit described here.

Prepare a mature, filtered home with cover

Use an aquarium of at least 10 litres for a group of small freshwater shrimp. Increase the volume if fish will share the aquarium. OATA gives this as broad guidance for freshwater shrimp and snails and explains that larger aquariums provide more stable temperature and water quality.

Prepare and mature the aquarium before livestock arrives. Our shrimp-keeping guide sets out the preparation sequence, while the practical acceptance test here is clear: the filter should be operating and ammonia and nitrite should both test at zero. Do not use the passage of time alone as the test of readiness.

Build the essential structure

• Filter: install a working filter in every aquarium and maintain its biological media.
• Substrate: provide aquarium gravel or sand.
• Cover: add live plants where practical. Plastic plants, suitable ornaments, plant pots or model caves can provide shelter when live plants are not used.
• Usable volume: allow more than the 10-litre group baseline when fish or additional livestock add waste and occupy space.

The RSPCA explains the role of biological filtration: beneficial bacteria process toxic ammonia into nitrite and then into the safer nitrate. This means a filter is not simply equipment that moves water. Its established bacterial population is part of the aquarium’s life-support system.

Check the layout before adding the shrimp. Cover should be distributed through the aquarium rather than concentrated in one inaccessible ornament. The aim is to give the animals places to withdraw while leaving enough open access for feeding and observation. Plants and suitable furnishings can satisfy that need without changing the requirement for water testing.

A worked space decision is straightforward. A shrimp-only group can begin with the OATA baseline of at least 10 litres. If fish are added, move above that baseline rather than trying to fit both groups into the same minimum. The final stocking level must still be increased slowly, because a larger aquarium does not make the biological filter respond instantly to extra waste.

Keep the water within the stated range and test it

Keep the aquarium at 17–27°C, pH 6.5–8.0 and 4–18°dH general hardness. OATA also gives a carbonate-hardness range of 3–15°dKH for freshwater shrimp and snails. Use these as the working limits for this care plan and compare them with measurements from the aquarium rather than estimates based on local tap-water reputation.

Measure the aquarium at least weekly. The water-chemistry guide explains what the principal tests mean, and the water matcher can help compare measured values with the working range. Enter measurements from the aquarium itself, because those values decide whether the shrimp’s environment meets the plan.

Respond to the result, not just the schedule

If ammonia or nitrite is above zero, stop increasing the livestock load and check the biological filter. Review recent additions and feeding because both increase the waste that the bacterial population must process. If nitrate rises beyond the stated limit, carry out the scheduled partial water change and review whether uneaten food or accumulated solid waste is contributing.

When temperature, pH or hardness sits inside the stated range, record the result and look for consistency at the next test. When a value sits outside it, correct the husbandry cause carefully and measure again. Testing turns a broad instruction into a decision based on the aquarium in front of you.

Complete the same maintenance cycle every week

Change 25% of the aquarium water at least once every week. Treat replacement tap water with a conditioner that removes chlorine or chloramine before it enters the aquarium. Use the water change to siphon solid waste from accessible areas of the gravel while keeping enough cover and furnishing in place for the shrimp.

Use this weekly sequence

1. Test ammonia, nitrite and nitrate before deciding whether livestock can be increased.
2. Measure temperature and pH, then check hardness often enough to know that it remains within the working range.
3. Remove 25% of the aquarium water and siphon accumulated solid waste.
4. Condition the replacement water against chlorine and chloramine before adding it.
5. Check the filter for blockages and confirm that it is operating normally.
6. Inspect the shrimp’s activity, appearance and interest in food.
7. Record unusual results so the next test shows whether the change was temporary or continuing.

Clean filter media only when required. Rinse it lightly in the aquarium water removed during the partial water change. Do not wash established filter media under the tap, because chlorine or chloramine can kill the beneficial bacterial population that processes waste.

Separate maintenance decisions instead of trying to solve every issue by cleaning everything. A blocked filter needs attention, but established media should be preserved. Solid waste should be siphoned, but routine work should not remove the aquarium’s shelter. Replacement water needs conditioning, while the aquarium still needs testing after maintenance to show how the system responds.

Use the weekly result to control the pace of stocking. Zero ammonia and nitrite are essential, but they are not a reason to add many animals at once. Every increase in livestock and feeding requires the filter’s bacterial population to increase. Add gradually, continue testing and pause if waste values rise.

This routine also provides a consistent observation point. Compare the shrimp’s usual activity, colour, feeding and use of cover from week to week. A repeatable schedule makes a genuine change easier to recognise than occasional checks performed only after a problem becomes obvious.

Feed a light algae-based routine two or three times a week

Allow the shrimp to graze on algae in the aquarium and supplement that grazing with algae wafers so they receive enough food; commercial freshwater-shrimp pellets can also be used. Follow OATA’s group feeding routine of only two or three feeds each week. Give the animals at least 30 minutes to feed before judging whether the portion was appropriate.

Start with a restrained portion. The useful measure is not how much food enters the aquarium, but whether the shrimp can feed without a significant amount remaining to break down. Uneaten food releases waste as it decomposes, so overfeeding can undermine the zero-ammonia and zero-nitrite targets even when the filter has previously been stable.

Use variety within the supported choices instead of increasing frequency. Keep algae wafers in the routine, use commercial shrimp pellets as well if you wish, and let natural algae grazing continue between scheduled meals. Feed for the animals present, not for the amount of open floor space or the aquarium’s water volume.

When more shrimp or other livestock are added, reconsider the portion but do not make a large jump. Increased feeding raises the waste load and requires a corresponding response from the biological filter. Increase slowly, test weekly and use ammonia, nitrite, nitrate and uneaten food as the checks on your decision.

A missed feeding response is also an observation opportunity. Reduced intake can accompany a health or water-quality change, so test the aquarium and compare activity, colour and appearance instead of trying to tempt the shrimp with repeated extra food.

Protect the shrimp from copper and act on health changes

Check every aquarium treatment before use and choose only products identified as safe for invertebrates. Freshwater shrimp are highly sensitive to copper and will die after exposure even at low levels. Do not treat the whole aquarium first and investigate compatibility afterwards.

Observe the same signs each week

• Activity: look for increased inactivity, restlessness or other departures from the animal’s usual movement.
• Colour: note an unusual darkening or paling.
• Hiding and aggression: notice whether the shrimp hides more than normal or its level of aggression changes.
• Breathing: watch for a changed breathing rate or effort, including spending more time in areas with higher oxygen levels.
• Body condition: check for noticeable weight loss, weight gain or abnormal swelling.
• External appearance: look for white spots, discolouration, lesions, abnormal growths, exoskeleton damage or lost appendages.
• Feeding: record reduced intake or a lack of interest in food.

One unusual action does not replace a water test. When behaviour or appearance changes, measure ammonia, nitrite, nitrate, temperature and pH, then inspect filtration and recent feeding. This sequence checks the environmental causes that routine husbandry can address without guessing at a diagnosis.

If ammonia or nitrite is detectable, do not add more animals. Check filter operation, recent stocking and uneaten food, then carry out the water-quality maintenance the result requires. If a treatment is being considered, read its invertebrate-safety instructions and copper information before it enters the aquarium.

When a health change continues, test ammonia, nitrite, nitrate, temperature and pH again, correct any value outside the stated range and add no further animals until every result is back within it.

Keep health observation tied to the weekly routine even when nothing appears wrong. Familiarity with normal activity, colour and feeding makes a later change easier to identify promptly.

Introduce the shrimp slowly without overloading the filter

Before the parcel is due, follow OATA’s care guidance by testing the destination aquarium and confirming that ammonia and nitrite are zero. Check that the filter is operating, the aquarium lies within the working temperature and pH ranges, and suitable cover is already in place.

Follow the arrival sequence

1. Someone must be present to receive the parcel so it is not left unattended.
2. Start a short continuous unboxing video before the parcel is opened, showing the parcel still sealed with the outer box visible.
3. Open the parcel in the same continuous take and show the shrimp still inside the sealed bag before anything is disturbed.
4. Float the bag in the aquarium for 20–30 minutes before releasing the shrimp.
5. Do not pour the transport-bag water into the aquarium.

These steps come from the Tropical Fish Co delivery and Live Arrival Guarantee policy. The policy also explains that live animals are hand-bagged in pure oxygen, placed in an insulated poly box and packed with a heat pack when weather conditions call for one. Tracking and the confirmed arrival date are sent by email, and the parcel travels with a licensed live-animal courier.

Make the first post-arrival decision from observation and testing. Confirm that the filter continues to operate and watch the shrimp’s activity, colour, breathing effort, body condition and interest in food. If behaviour changes, test the water rather than adding food or treatment automatically.

Add further livestock gradually. OATA warns that increasing animal numbers too quickly can produce new tank syndrome when the biological filter’s bacteria cannot process the extra waste. The same principle applies when feeding rises: the filter needs time to develop enough bacteria for the increased load.

Screen every fish for mouth size and predatory behaviour

Do not mix this shrimp with any species known to be predatory or with any fish able to fit the shrimp in its mouth. OATA notes that freshwater shrimp may be eaten by common aquarium fish, so a general community label is not enough to establish compatibility.

Use a direct screening sequence

1. Identify every fish already in the aquarium and every fish planned for it.
2. Exclude species known to be predatory.
3. Compare each fish’s mouth size with a shrimp at the 1–1.5 cm dispatch grade.
4. Remember that the dispatch measurement describes arrival size, so the initial predation screen must use that small scale.
5. Increase aquarium size above the 10-litre shrimp-group baseline when fish share the system.
6. Provide plants or suitable furnishings as cover without treating cover as a substitute for the predation test.

A fish can fail the compatibility screen even when the aquarium has ample volume. Space supports water stability and reduces crowding, but it does not remove a predator’s feeding behaviour or make a small shrimp too large to swallow. Apply the biological rule first, then assess space and filtration.

Use caution with every mixed community because the outcome depends on the animals involved. Treat no fish as automatically safe with shrimp. Review adult and present mouth size, feeding behaviour and known predatory tendencies for each proposed species.

Ask us once you have the aquarium volume, measured water values and the names and sizes of the other inhabitants. That information allows a stocking assessment based on predation risk and biological capacity rather than a universal tank-mate label.

Plan a social group and mixed invertebrates carefully

Plan for shrimp as social animals and use at least 10 litres for a group of small freshwater shrimp. Increase their number slowly so the biological filter has time to respond to additional waste and feeding. Use water tests, not aquarium volume alone, to decide when the system is ready for another addition.

OATA describes freshwater shrimp and snails as generally compatible with most species in the aquarium, but every mixed plan still needs screening. Check whether any animal can eat the shrimp, whether the aquarium provides enough space for all inhabitants and whether their water needs fit the working range of 17–27°C, pH 6.5–8.0 and 4–18°dH.

Separate the four compatibility decisions

• Predation: reject fish that are predatory or can swallow the shrimp.
• Water: make sure every inhabitant can be maintained within the same measured temperature, pH and hardness range.
• Space: move above the 10-litre group baseline whenever fish are included.
• Biological capacity: add animals slowly and keep ammonia and nitrite at zero.

Do not use another shrimp or snail’s small body size as the only reason to combine it with Neocaridina denticulata. Small animals still add waste, require feeding and may have different water needs. A mixed-invertebrate plan passes only when all four decisions align.

For example, an aquarium can pass the water test but fail the capacity test if ammonia rises after recent additions. It can pass the capacity test but fail the fish screen when an inhabitant can swallow a 1–1.5 cm shrimp. It can pass both and still need more volume because fish share the aquarium. Treat each result independently.

After any addition, continue the weekly 25% water change, regular testing and health observations. Pause further stocking if ammonia or nitrite appears, feeding leaves persistent waste or the shrimp show marked changes in activity, colour, hiding or feeding. This keeps compatibility tied to conditions in the aquarium rather than to a fixed list of supposedly safe companions.

Answer common questions before keeping this shrimp

How big does Neocaridina denticulata get?

The 1–1.5 cm figure is the dispatch grade and describes the shrimp supplied rather than its mature size. Plan its home from OATA’s guidance of at least 10 litres for a group of small freshwater shrimp, with more space when fish share the aquarium.

What size aquarium does Neocaridina denticulata need?

Use at least 10 litres for a group of small freshwater shrimp and choose a larger aquarium when fish are included. OATA gives this as group guidance and notes that larger volumes provide more stable temperature and water quality.

How many Neocaridina denticulata should I keep together?

Plan a social group, add its members gradually and use at least 10 litres as OATA’s baseline for a group of small freshwater shrimp. The final number must suit the aquarium volume, filter capacity, other inhabitants and measured water quality.

Does this shrimp suit a beginner?

Neocaridina denticulata requires a mature filtered aquarium, water tests at least once a week, a 25% water change at least once every week, restrained feeding and careful protection from copper and predatory fish. Choose it only when you can carry out every one of those tasks from the day the shrimp arrives.

What does Neocaridina denticulata eat?

Let it graze on aquarium algae and supplement this with algae wafers or commercial freshwater-shrimp pellets. OATA’s group routine is only two or three feeds a week, allowing at least 30 minutes for feeding and avoiding portions that leave waste to decompose.

What temperature and pH does this shrimp need?

Keep it at 17–27°C, pH 6.5–8.0 and 4–18°dH general hardness, which OATA gives as group guidance for freshwater shrimp and snails. Maintain ammonia and nitrite at zero and test the aquarium at least weekly.

Is it aggressive or likely to nip fish fins?

Base the community decision on predation and mouth size: never mix this shrimp with predatory fish or fish able to fit it in their mouth. Observe every mixed group and investigate marked changes in activity, hiding or feeding.

Which kinds of animals can it live with?

Freshwater shrimp and snails may be considered only after their water, space and stocking needs have been checked. Any fish must pass the stricter rule that it is not predatory and cannot fit the shrimp in its mouth.

How does this shrimp travel to a UK home?

Start a short continuous unboxing video before opening every parcel, showing it still sealed, then opening it and the shrimp still inside the sealed bag. Tropical Fish Co hand-bags live animals in pure oxygen and uses an insulated poly box, with a heat pack when the weather calls for one. Someone must receive the parcel; float the bag for 20–30 minutes before release and do not pour bag water into the aquarium. Open and inspect the parcel the same day it arrives, and send the video with your order number that day for any Live Arrival Guarantee claim.

Consult the reference bibliography

• WoRMS: accepted scientific name, family and taxonomic placement.
• Wikipedia: natural history and East Asian range of the genus Neocaridina.
• OATA: freshwater shrimp and snail water values, aquarium planning, feeding, maintenance, introduction, health observation and compatibility.
• RSPCA: the function of biological filtration and its beneficial bacteria.
• Tropical Fish Co delivery policy: packing, receipt and acclimatisation procedure.