Spotted Nerite Snail (Neritina sp.)

Identify the snail before planning its care

The Spotted Nerite Snail (Neritina sp.) is an aquatic gastropod in the nerite family, Neritidae. The World Register of Marine Species accepts Neritina as a genus. This freshwater aquarium snail suits a keeper prepared to provide a mature, filtered aquarium, stable measured water, established grazing surfaces and carefully screened companions.

The “sp.” means the animal is identified to genus rather than species. Shell colour and markings should therefore remain a trade description rather than being used to assign a different scientific identity. Plan care around the stated genus and freshwater snail guidance instead of treating the spotted pattern as a species diagnosis.

Wikipedia’s account of Neritina describes members of the genus as small aquatic snails with an operculum in the family Neritidae. The genus includes marine, brackish-water and sometimes freshwater gastropods; this particular offer is catalogued as a freshwater aquarium mollusc.

Decide whether the aquarium is suitable

Choose this animal for its natural grazing behaviour, but continue ordinary aquarium cleaning and water changes. A snail can help control nuisance algae without guaranteeing that every surface or every type of algae will be cleared.

Understand the sold unit

One purchase supplies one Spotted Nerite Snail. Treat that sold unit as commerce information rather than a stocking formula: the aquarium must be assessed for water quality, food-bearing surfaces and compatible inhabitants before another grazer is added.

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

The exact species has not been identified, so the care advice here follows the genus Neritina and its care group.

The gallery images are representative, based on reference photographs of this kind of animal, so colours can look slightly different from the live animal.

Check the offer in the right order

1. Prepare a mature freshwater destination before the animal arrives.
2. Confirm that ammonia and nitrite are both zero mg per litre.
3. Check that established algae or another suitable grazing surface remains in the aquarium.
4. Screen every existing inhabitant for snail-eating behaviour and food competition.
5. Base identity and care on Neritina sp., not on a species inferred from shell markings.

Use the current snails collection to compare other snail identities and sold units. Each different animal still needs its own water, food and compatibility assessment.

Read the current delivery and Live Arrival Guarantee policy before the delivery date so someone can receive the parcel, film the sealed parcel being opened and follow the acclimatisation steps.

Plan space and water conservatively

Use approximately 20 litres as the initial aquarium planning figure for this genus-level snail. OATA recommends at least 10 litres for a group of small freshwater shrimp or snails and approximately 20 litres for larger species; where adult size is not assigned at species level, plan with the larger group category. Increase the aquarium size when fish are included because OATA specifically says that mixed fish-and-invertebrate aquariums need more space.

Keep the aquarium at 17–27°C, pH 6.5–8.0 and general hardness 4–18°dH. OATA’s freshwater shrimp and snail sheet provides these as broad group guidance, not a species-specific optimum. Its carbonate-hardness range is 3–15°dKH.

The larger aquarium is usually easier to keep environmentally stable. Do not translate the planning figure into one snail for every 20 litres: food-bearing surface area, other grazers, fish and filter capacity all affect the number the aquarium can support.

Build a mature, filtered home

Use a mature aquarium with a working biological filter before introducing the snail. OATA warns that increasing livestock too quickly can leave too few nitrifying bacteria to process the extra waste and feeding, causing unhealthy ammonia and nitrite levels. Add livestock gradually so the filter can adjust.

The RSPCA explains biological filtration as beneficial bacteria processing toxic ammonia into nitrite and then into the safer nitrate. Test the actual aquarium rather than assuming that a running filter is ready. Ammonia and nitrite must both read zero mg per litre before introduction.

Prepare each part of the aquarium

• Filter: run a properly established biological filter and check it regularly for blockages.
• Substrate: use aquarium gravel or sand.
• Cover and structure: provide live plants where practical, or use suitable artificial plants and secure ornaments for cover.
• Grazing: retain accessible surfaces carrying established algae rather than cleaning every surface immediately before arrival.
• Water: test ammonia, nitrite, nitrate, temperature, pH and hardness before adding the animal.

If this is your first invertebrate aquarium, use the aquarium preparation and maturation guide to organise filter maturation, testing and routine maintenance before livestock arrives. Apply the shared aquarium-preparation principles while following the snail-specific feeding and compatibility instructions on this page.

A visually clean aquarium is not automatically a mature one. The useful checks are zero ammonia, zero nitrite, a functioning filter and an established grazing area. Preserve some algae-bearing surfaces during maintenance so the snail does not lose its natural food base all at once.

Make the first stocking decision

Begin only when the aquarium passes every preparation check. If ammonia or nitrite is measurable, delay introduction and restore safe water first. If surfaces have been scrubbed clean, allow a food base to establish and prepare suitable supplementation rather than expecting the snail to live on a bare aquarium.

Control water with measurements

Measure the destination aquarium and keep it at 17–27°C, pH 6.5–8.0, general hardness 4–18°dH and carbonate hardness 3–15°dKH. These are OATA’s freshwater shrimp and snail group values, so stability within the range is the practical aim.

Use the water chemistry guide to understand what each result measures. Then enter the measured values into the water matcher to compare the aquarium with the stated guidance.

Make decisions from the test result

Do not judge hardness from a postcode or a description of regional tap water. Test the water entering the aquarium and the aquarium itself because décor, substrate and previous additions can affect the final values.

Record results at least weekly so changes can be seen over time. A sequence of measurements is more useful than one isolated result when feeding, stocking or maintenance has changed.

Use a worked weekly check

For example, an aquarium at 23°C, pH 7.4, 10°dH and 7°dKH sits within all four group ranges. That result is useful only when ammonia and nitrite are also zero and nitrate remains within the stated limit. If the next test shows nitrite above zero, the earlier acceptable temperature and hardness readings do not make introduction safe; resolve the nitrite first.

Feed a surface grazer without overfeeding

Provide established algae-bearing surfaces and supplement them with algae wafers or suitable commercial pellets. OATA describes freshwater shrimp and snails as generally herbivorous animals that graze aquarium algae, then recommends supplemental food to make sure they receive enough.

Feed two or three times a week. Leave pellets or wafers for at least 30 minutes so the snail has time to reach and eat them, but prevent uneaten food from remaining and breaking down into toxic waste.

Use a simple feeding decision loop

1. Inspect several accessible surfaces for algae before adding the snail.
2. Observe whether the snail moves across and grazes those surfaces.
3. Offer an algae wafer or suitable commercial pellet two or three times during the week.
4. Allow at least 30 minutes for feeding.
5. Remove food that remains uneaten before it decays.
6. Review the amount before the next feed instead of automatically adding more.

Overfeeding does not create a safer food reserve. Uneaten food decomposes, adds waste and can contribute to harmful ammonia or nitrite. Adjust the amount to what the animal consumes while preserving a natural grazing area.

Read the aquarium rather than the calendar alone

Continue normal maintenance even when the snail grazes visible algae. It helps with nuisance growth but does not replace waste removal, filter care, testing or water changes.

Stock from grazing capacity, not litres alone

Neritina snails do not need a social group. OATA describes snails as animals that are not social, so one can be kept without adding companions of the same kind. Consider another snail only when the aquarium still provides suitable food and stable water.

The sold unit is one animal, but it is not a rule of one snail for each fixed volume. OATA’s aquarium figures are group planning guidance, while the actual stocking decision also depends on established algae, supplemental feeding, fish, competing grazers and biological filtration.

Before adding another grazer

• Test the water: ammonia and nitrite must remain at zero mg per litre.
• Inspect the surfaces: established algae should remain accessible after ordinary maintenance.
• Watch feeding: confirm that the first snail can reach food before adding competition.
• Review other animals: fish, shrimp and other snails may consume the same natural or prepared food.
• Check filter response: make sure the aquarium remains stable after each livestock or feeding increase.

A 40-litre aquarium can still be a poor home for several grazers if its surfaces have been scrubbed clean and other inhabitants take every wafer. Conversely, passing the approximate 20-litre planning figure does not automatically make an aquarium suitable if ammonia or nitrite is detectable.

Add animals slowly. OATA explains that beneficial bacteria need to increase as livestock and feeding increase; stocking too quickly can cause new tank syndrome, with unhealthy ammonia and nitrite that may make freshwater snails ill or kill them.

Check the first month

Follow the arrival procedure in order

Prepare the mature destination before delivery, with the filter running and ammonia and nitrite at zero mg per litre. Someone must be present to receive the live-animal parcel, and the parcel must be opened and inspected on the day it arrives.

Use this arrival sequence

1. Be present at the delivery address to receive the parcel.
2. Start filming every delivery while the parcel is still sealed and the outer box is visible.
3. Open the parcel in one continuous take.
4. Keep filming with the animal still inside the sealed bag so its condition is visible before anything is disturbed.
5. Float the bag for 20–30 minutes before releasing the snail.
6. Release the snail without pouring the bag water into the aquarium.

Keep the continuous unboxing video and order number. If a Live Arrival Guarantee claim is needed, contact us on the day the animal arrives and provide the video showing the sealed parcel, the continuous opening and the animal still inside the bag.

Check the destination separately

Test the aquarium before the parcel arrives rather than trying to solve a water-quality problem during acclimatisation. The destination should be within 17–27°C and pH 6.5–8.0, with ammonia and nitrite at zero mg per litre. These checks come from OATA’s freshwater shrimp and snail guidance.

First-week checkpoints

Do not treat a single movement or period of rest as a complete health diagnosis. Compare behaviour over time and test the aquarium whenever normal activity or feeding changes.

Maintain the filter and act on changes

At least once every week, carry out a partial water change of 25%. Treat replacement tap water with a suitable conditioner to remove chlorine or chloramine before adding it to the aquarium.

Test the water at least once per week. Ammonia and nitrite must remain at zero mg per litre, while nitrate should not exceed 20 mg per litre above the normal tap-water level. Check temperature, pH and hardness when activity, feeding or appearance changes.

Protect the biological filter

• Check the filter for blockages during routine maintenance.
• If cleaning is needed, rinse the media lightly in aquarium water removed during the partial water change.
• Do not run the filter media under the tap because chlorine or chloramine may kill the established beneficial bacteria.
• Retest the aquarium after a blockage, major cleaning, feeding increase or livestock addition.

Respond to warning signs

OATA recommends watching for changes in activity, colour, temperament, appearance, condition and feeding because these may reveal a problem before it becomes more serious. Assess changes against the animal’s normal pattern instead of relying on a single isolated observation.

Use the weekly routine as a checkpoint

Combine the water change, testing and filter inspection into one recorded routine. If ammonia or nitrite is above zero, prioritise water quality and filter function. If tests remain stable but feeding falls, check food access and companion behaviour next. Distinct observations lead to clearer action than changing several things at the same time.

Protect the snail from copper

Never expose this snail to copper, even at low levels. OATA states that freshwater shrimp and snails will die if exposed even to low levels of copper. Check every treatment before it enters the aquarium and use only products stated to be safe for invertebrates.

Check a treatment before use

• Read the complete current label and identify the active ingredients.
• Confirm that the treatment is safe for aquatic invertebrates.
• Do not assume that a medicine intended for fish is suitable for a snail.
• Account for every aquarium inhabitant before adding a treatment.
• Keep treatment equipment separate where residue could expose the snail.

Do not weaken the instruction because a product contains only a small amount of copper. Even low levels are lethal to freshwater snails according to OATA’s group guidance.

Prevent accidental exposure

Check medicines, algae treatments and other aquarium additives before use. Measure doses exactly as directed and never improvise a treatment from an aquarium product whose invertebrate safety is unclear. Equipment previously used with copper can also create an avoidable exposure route, so keep its use controlled.

Good water quality remains the first husbandry response to unusual behaviour. Test ammonia, nitrite, nitrate, temperature and pH, review recent additions and inspect companion behaviour. A water-quality correction can remove an environmental stress, but it does not justify adding an unapproved medicine.

Separate treatment from routine care

Never release aquarium animals or water into the wild. Arrange responsible rehoming through an appropriate aquarium keeper or retailer if care cannot continue.

Screen every companion before mixing

Avoid pufferfish, loaches that eat snails and any other fish capable of eating the snail. OATA specifically says that snails should not be mixed with fish that can eat them and names pufferfish and loaches as examples.

Avoid assassin snails because OATA describes them as predators of other snail species. Do not treat additional space or extra food as a way to make a predator safe.

Use four compatibility checks

Do not approve a companion from a broad label such as “community fish” alone. Check the actual kind of fish and whether it eats snails. OATA warns that freshwater shrimp and snails may be eaten by common aquarium fish, so peaceful behaviour towards other fish is not enough to pass the screen.

Shrimp and other non-predatory invertebrates still require a food check. Animals that graze the same algae or take every supplemental pellet can leave too little food for the snail even when there is no direct attack.

Apply the rule before introduction

1. Identify every proposed companion.
2. Reject pufferfish, snail-eating loaches, assassin snails and any other known snail predator.
3. Compare the water needs of the remaining animals.
4. Check that enough established grazing and supplemental food can reach the snail.
5. Increase aquarium space when fish are included and monitor filtration after stocking.

Compatibility remains a continuing observation rather than a one-time label. Reassess it when fish grow, livestock changes or competition for food increases.

Act quickly on competition or predation

Observe access to food and safe surfaces after adding any companion. A pairing that initially appears calm can still fail if the other animal begins eating snails, taking every food item or causing the snail to remain unusually inactive.

Use behaviour to decide the next action

A larger aquarium can provide more water volume and grazing surfaces, but it does not make a predator compatible. The avoid rule for pufferfish, snail-eating loaches and other fish that eat snails remains unconditional.

Food competition is a separate decision from predation. Shrimp or another snail may not attack this animal, yet the pairing can still become unsuitable if one animal takes all supplemental food or the shared grazing surfaces are depleted.

Compare three practical cases

• Pufferfish: reject the pairing because OATA names pufferfish among fish that can eat snails.
• Snail-eating loach: reject the pairing for the same predation reason.
• Non-predatory grazer: assess water overlap, food access, aquarium volume and filter capacity before proceeding.

Keep any separation aquarium mature, filtered and within the appropriate water range. Moving the snail away from predation should not replace one hazard with measurable ammonia, nitrite or a lack of food.

Review compatibility again whenever a fish grows or a new inhabitant is added. A current pass applies only while predation risk, water conditions, food access and filter capacity remain suitable.

Answer common buying and care questions

How big does a Spotted Nerite Snail get?

The Spotted Nerite Snail is identified as Neritina sp. rather than a particular species, so plan its aquarium with OATA’s larger freshwater snail category of approximately 20 litres instead of assigning a species-sized adult length.

What size aquarium does it need?

Use approximately 20 litres as the initial planning figure. OATA recommends at least 10 litres for a group of small freshwater shrimp or snails and approximately 20 litres for larger species; use more space when fish share the aquarium.

How many Spotted Nerite Snails should I keep?

Spotted Nerite Snails do not require a social group. Start with one, then consider another only when ammonia and nitrite remain at zero mg per litre and established grazing and supplemental food remain sufficient.

Is this snail suitable for a beginner?

It suits a keeper who can mature and test a filtered aquarium, maintain OATA’s group values of 17–27°C and pH 6.5–8.0, preserve grazing surfaces, control feeding and prevent copper exposure.

What does a Spotted Nerite Snail eat?

A Spotted Nerite Snail grazes aquarium algae. OATA recommends supplementing this with algae wafers or suitable commercial pellets two or three times a week, allowing at least 30 minutes for feeding and removing uneaten food before it decays.

What temperature and pH does it need?

Keep it at 17–27°C and pH 6.5–8.0. OATA’s freshwater shrimp and snail group guidance also gives general hardness of 4–18°dH and carbonate hardness of 3–15°dKH.

Is a Spotted Nerite Snail aggressive or likely to nip fins?

A Spotted Nerite Snail is a grazing gastropod rather than a fin-nipping fish. The main compatibility risk runs in the other direction: freshwater snails may be eaten by aquarium fish.

Which animals can this snail live with?

Choose individually screened animals with overlapping water needs that do not eat snails and will not take all available food. Avoid pufferfish, loaches that eat snails, assassin snails and any other known snail predator.

How does a Spotted Nerite Snail arrive alive?

Film every delivery continuously from the sealed parcel before floating the bag: be present to receive it, show the outer box, open it in one take and show the animal still inside the sealed bag. Float the bag for 20–30 minutes, then release the snail without pouring the bag water into the aquarium.

Check the care and identity references

• World Register of Marine Species: accepted genus and family placement for Neritina.
• Wikipedia, Neritina: genus-level natural history, including its placement among aquatic snails with an operculum.
• Ornamental Aquatic Trade Association: freshwater shrimp and snail guidance covering water, aquarium planning, feeding, maintenance, introduction, copper and compatibility.
• RSPCA: general aquarium welfare guidance explaining biological filtration and the processing of ammonia and nitrite.
• Tropical Fish Co delivery policy: receiving, continuous unboxing video, floating and Live Arrival Guarantee procedures.