Should I buy it?
Nerite Snail
Neritina natalensis
Also known as: zebra nerite, horned nerite, tiger nerite, olive nerite
The best freshwater algae snail on the hobby market, with the trade-off that the white egg capsules look untidy and cannot be hatched.
Nerite Snail tank mates · 30L tank size hub
peaceful · beginner care
Sources & confidencemedium · partially verified · beginner: excellent
Typical care sources — real tanks still vary. Numbers here are a careful starting point. Your tap water, tank size, and habits decide the rest. How we evaluate.
Best for: Any established planted tank 20L or more wanting glass and substrate algae cleared without plant damage or uncontrolled breeding.
Avoid if: You keep pea puffers or assassin snails, or you cannot tolerate white egg capsules on hard surfaces.
Common mistakeExpecting nerite egg capsules to hatch in freshwater is how keepers invent a fake breeding crisis and scrape panic. Capsules cement to hard surfaces and need brackish water for larvae — they are a cosmetic texture issue, not a population explosion. Accept them, scrape them, or skip nerites.
Top things that go wrong
- Shrimp & snails. Compatible with shrimp; not safe alongside assassin snails which will pick off small nerites.
What most shops don't tell you
- 1.Myth: nerite snails are foolproof algae erasers that breed into a free cleanup crew in any freshwater tank. Reality: eggs do not hatch in freshwater, shells need minerals, and nerites walk out of open tops — they are grazers with limits, not a magic filter.
- 2.White egg capsules cement to every hard surface and do not hatch in freshwater. A keeper either accepts them as background texture or scrapes them off.
- 3.Soft acidic planted tanks with no calcium top-up. The shell pits and cracks within months, and the snail dies slowly.
- 4.Open-top tanks. Nerites walk out overnight and dry on the floor by morning. A loose-fitting lid or a glass strip across feeding holes solves it.
- 5.Three things matter on day one. Hard alkaline water for shell health, a tight lid because nerites climb out, and a calcium source (cuttlebone, crushed coral substrate) in soft-water tanks. A nerite in a 6.5 pH soft-water tank pits its shell in months.
About this species
Nerite snails are small algae-grazing snails from Neritidae. They sit on glass and decor and graze soft algae down to clean. Best freshwater algae snail on the market, with one catch: they cannot breed in freshwater. Females lay tough white egg capsules on every hard surface that never hatch.
- Blue Dream Shrimp20L min · same group, comparable tank size
- Cherry Shrimp20L min · same group, comparable tank size
- Malaysian Trumpet Snail20L min · same group, comparable tank size
- Amano Shrimp40L min · same group, similar adult size
- Ghost Shrimp40L min · same group, similar adult size
- Mystery Snail40L min · same group, similar adult size
- Bamboo Shrimp80L min · same fish family
- Amano Shrimpalso beginner peaceful, similar tank size
- Beckford Pencilfishalso beginner peaceful, similar tank size
- Black Neon Tetraalso beginner peaceful, similar tank size
- Bloodfin tetraalso beginner peaceful, similar tank size
- Blue Dream Shrimpalso beginner peaceful, similar tank size
- Cherry Barbalso beginner peaceful, similar tank size
- Blue Dream Shrimp tank matesnames this fish as a conditional pairing — read the pair page conditions
- Cherry Shrimp tank mateslists this fish as a safe and recommended mate
Plan grid
Key limits are above. Here: pH band, swim level, bioload, and activity.
Swim zones
Care snapshot
Quick compare before you buy. Not a score of how “good” the fish is.
- Beginner ease82
- Peacefulness90
- Community fit72
- Small-tank fit100
- Hardiness76
- Energy24
Numbers are deterministic planning indices from Fishori fields — not a scientific score of your individual fish.
Example setups
Starting points only. Run the pair checker for every fish you add.
Rough 90L+ layout: one calm centrepiece, 8–12 small tetras/rasboras, 6–8 corydoras-type bottom fish — verify every name in the pair checker before buying.
Safer directions include: Cherry Barb, Harlequin Rasbora.
Compatibility
Tank mates for Nerite Snail
Usually safer (engine GOOD): Cherry Barb, Harlequin Rasbora. Conditional (CAUTION — read the pair page before buying): Amano Shrimp, Corydoras Catfish, Neon Tetra. Avoid (RISKY): Assassin Snail, Jack Dempsey, Oscar, Pea Puffer. Every name links to a live pair check — the lists are a shortlist, not a stocking plan.
Usually safer
Open a pair page with this fish as the starting point.
Needs planning
Read the blocking rule on each pair page before experimenting.
Usually avoid
Do-not-stock combinations on conservative hobby rules.
Compare with
Run a real pair check: Nerite Snail + Cherry Barb
Behaviour and temperament
Nerite snails are peaceful grazers that ignore fish and shrimp. They do not defend territory. Stress shows as prolonged inactivity and pitted shells when water is too soft or food film disappears. Jumping/walking out is husbandry failure on lids, not aggression.
What sets them off
- Sudden crowding
- Poor water quality
Fin nipping: Not a habitual fin-nipper; stressed or crowded individuals can still test fins.
Predation: Not a predator toward similarly sized community fish; fry and dwarf shrimp are still fair game for most species.
Territory: Not strongly territorial, but still needs room so its working space does not overlap the next fish.
Planted tanks: excellent — easy plant ideas
In the glass: typical and warning signs
- A snail works glass, hardscape, and leaves for film, often more at night.
- White egg capsules on décor are normal freshwater ownership — they will not hatch here.
- Pitted shells mean minerals and diet failed before brand of algae wafer.
- A dried snail on the floor means the lid failed overnight.
- None toward fish; they are targets for assassins and puffers instead.
- They do not ‘fight’ plants — radula marks on soft leaves mean overstocked grazing pressure.
- Remove assassins or puffers if snail survival is the goal.
- Add a lid strip before buying another nerite to replace escapees.
Fish behaviour can vary between individuals and tank setups. Always observe new fish closely after introduction.
Water, food, and grouping
Hardness
medium-hard
Diet
herbivore
Nerite snails are algae grazers that need visible biofilm or supplemented wafers once the glass goes clean. A spotless high-tech scape with no calcium support starves and pits the shell. Offer blanched veg or algae wafers when film is thin, keep mineral hardness honest, and never treat them as a filter replacement.
Shrimp & snails
Compatible with shrimp; not safe alongside assassin snails which will pick off small nerites.
One nerite per ~20 to 30 L of grazing surface. More than that and the algae runs out and the snails starve.
- Hard alkaline water (pH 7.0 to 8.5, medium-hard or hard). Soft-water tanks need cuttlebone or crushed coral in the filter.
- A real lid. Nerites climb glass, silicone, and airline tubing.
- Algae or biofilm to graze. A brand new tank with no soft algae starves a nerite within weeks.
- Tank volume meets or exceeds 20L published minimum for adults.
- Heater can hold 22–28°C without cooking cooler-water tank mates.
Explore and stocking hubs
Tank-mates hub, matching guides, category peers, and litre stocking lists around this species’ minimum tank.
Plan with tools
Check mates as pairs first, then add this fish in the tank builder for the full stocking.
Filtration & heating
A 20L minimum tank needs a filter rated for at least 80L/hr turnover and a heater to hold 22–28°C reliably.
Plant suggestions
Nerite Snail does well in planted tanks. Plants compatible with 22–28°C and pH 7–8.5:
Research: partially verified · Confidence: medium · 2 linked source(s). We do not invent citations.
How Fishori evaluates compatibility (same logic as pair and tank tools).
- Aquarium Co-Op. Nerite Snail Care Guide
Primary: retailer care guide covering temperature, hardness, algae diet, egg-laying behaviour, and shell-pitting in soft acidic tanks.
- Seriously Fish. Neritina natalensis (Zebra Nerite)
Secondary: species reference for natural range (East African freshwater/estuarine), confirming brackish requirement for egg viability.
Evidence notes
- Trade name 'nerite' covers half a dozen species across Neritina, Vittina, and Neripteron. Care is consistent enough across the group for a single profile, but exact shell pattern depends on which species the shop received.
- Brackish-only breeding is the consensus across hobby and biology sources. Freshwater egg capsules are dead weight that some keepers scrape off, others leave; either is fine.
Featured compatibility checks
Curated pair pages for Nerite Snail. Each opens a full verdict — not just a list label.
Common questions about Nerite Snail
- How big do Nerite Snail get?
- Nerite Snail adults reach about 2.5 cm. Shop fish look smaller; stock for the adult length.
- What size tank does Nerite Snail need?
- 20L is the planning floor for adult swimming space and bioload. A 30L+ tank is the more comfortable long-term footprint. Length and depth matter as much as raw litres for active or territorial fish.
- Are Nerite Snail aggressive?
- Nerite snails are peaceful grazers that ignore fish and shrimp. They do not defend territory. Stress shows as prolonged inactivity and pitted shells when water is too soft or food film disappears. Jumping/walking out is husbandry failure on lids, not aggression.
- What is the most common mistake with Nerite Snail?
- Expecting nerite egg capsules to hatch in freshwater is how keepers invent a fake breeding crisis and scrape panic. Capsules cement to hard surfaces and need brackish water for larvae — they are a cosmetic texture issue, not a population explosion. Accept them, scrape them, or skip nerites.
- What fish can live with Nerite Snail?
- The Nerite Snail profile lists Cherry Barb, Harlequin Rasbora among its safer pairings (engine-checked GOOD). Amano Shrimp, Corydoras Catfish, Neon Tetra are conditional (CAUTION): workable only with the specific conditions on each pair page. Avoid Assassin Snail, Jack Dempsey, Oscar, Pea Puffer (RISKY). Run the pair checker for your exact water and tank size before stocking.