Photo: Gmelin, 1791 (CC0) — via Wikimedia Commons
Red Lip Nerite Snail (Neritina violacea)
A striking, variably patterned nerite with a bold red-orange lip that hoovers algae without ever reproducing in freshwater.
Will it live with a Red Lip Nerite Snail?
We compare each fish against your red lip nerite snail on temperament, size, water parameters and swimming zone. Set your tank size and filter the results.
- Assassin Snail✅ CompatiblePeaceful · 3 cm · Easy care · 22–26 °C (72–79 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Celestial Pearl Danio✅ CompatiblePeaceful · 2 cm · Medium care · 22–26 °C (72–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Celestial Pearl Danio in a shoal of 6+ or it gets stressed and nippy.
- Cherry Shrimp✅ CompatiblePeaceful · 3 cm · Easy care · 18–28 °C (64–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Keep Cherry Shrimp in a shoal of 10+ or it gets stressed and nippy.
- Chili Rasbora✅ CompatiblePeaceful · 2 cm · Medium care · 22–28 °C (72–82 °F)
- Compatible on the things that matter: shared water near 22–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Chili Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Dawn Tetra✅ CompatiblePeaceful · 2.5 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
- Keep Dawn Tetra in a shoal of 8+ or it gets stressed and nippy.
- Dwarf Spotted Rasbora✅ CompatiblePeaceful · 2.5 cm · Medium care · 23–28 °C (73–82 °F)
- Both are peaceful, and their water overlaps around 23–28 °C — no size, zone or temperament conflicts.
- Keep Dwarf Spotted Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Ember Tetra✅ CompatiblePeaceful · 2 cm · Easy care · 24–28 °C (75–82 °F)
- Compatible on the things that matter: shared water near 24–28 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Ember Tetra in a shoal of 8+ or it gets stressed and nippy.
- Emerald Dwarf Danio✅ CompatiblePeaceful · 2 cm · Medium care · 20–24 °C (68–75 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Emerald Dwarf Danio in a shoal of 8+ or it gets stressed and nippy.
- Endler's Livebearer✅ CompatiblePeaceful · 3 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
- Keep Endler's Livebearer in a shoal of 6+ or it gets stressed and nippy.
- Exclamation Point Rasbora✅ CompatiblePeaceful · 2 cm · Medium care · 22–28 °C (72–82 °F)
- Both are peaceful, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
- Keep Exclamation Point Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Glowlight Danio✅ CompatiblePeaceful · 3 cm · Easy care · 22–26 °C (72–79 °F)
- Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Glowlight Danio in a shoal of 8+ or it gets stressed and nippy.
- Gold Ring Danio✅ CompatiblePeaceful · 3 cm · Easy care · 18–26 °C (64–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Gold Ring Danio in a shoal of 8+ or it gets stressed and nippy.
- Hummingbird Tetra✅ CompatiblePeaceful · 1.8 cm · Hard care · 22–27 °C (72–81 °F)
- Compatible on the things that matter: shared water near 22–27 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Hummingbird Tetra in a shoal of 8+ or it gets stressed and nippy.
- Lambchop Rasbora✅ CompatiblePeaceful · 3 cm · Medium care · 23–28 °C (73–82 °F)
- Both are peaceful, and their water overlaps around 23–28 °C — no size, zone or temperament conflicts.
- Keep Lambchop Rasbora in a shoal of 6+ or it gets stressed and nippy.
- Malaysian Trumpet Snail✅ CompatiblePeaceful · 3 cm · Easy care · 21–27 °C (70–81 °F)
- Both are peaceful, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Neon Green Rasbora✅ CompatiblePeaceful · 2 cm · Easy care · 22–26 °C (72–79 °F)
- Compatible on the things that matter: shared water near 22–26 °C, workable temperaments, and no predator-and-prey size gap.
- Keep Neon Green Rasbora in a shoal of 10+ or it gets stressed and nippy.
- Neon Tetra✅ CompatiblePeaceful · 3 cm · Easy care · 20–26 °C (68–79 °F)
- Both are peaceful, and their water overlaps around 22–26 °C — no size, zone or temperament conflicts.
- Keep Neon Tetra in a shoal of 6+ or it gets stressed and nippy.
- Nerite Snail✅ CompatiblePeaceful · 2.5 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Pea Puffer✅ CompatibleSemi-aggressive · 2.5 cm · Medium care · 24–28 °C (75–82 °F)
- Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 24–28 °C — no size, zone or temperament conflicts.
- Ramshorn Snail✅ CompatiblePeaceful · 2 cm · Easy care · 20–28 °C (68–82 °F)
- Both are peaceful, and their water overlaps around 22–28 °C — no size, zone or temperament conflicts.
- Ruby Tetra✅ CompatiblePeaceful · 2 cm · Medium care · 23–28 °C (73–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Ruby Tetra in a shoal of 8+ or it gets stressed and nippy.
- Scarlet Badis✅ CompatibleSemi-aggressive · 2 cm · Medium care · 22–27 °C (72–81 °F)
- Peaceful + Semi-aggressive, but with no direct clash here, and their water overlaps around 22–27 °C — no size, zone or temperament conflicts.
- Both favour the bottom of the tank — offer enough cover so they aren't always in each other's space.
- Strawberry Rasbora✅ CompatiblePeaceful · 2 cm · Medium care · 23–28 °C (73–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Strawberry Rasbora in a shoal of 8+ or it gets stressed and nippy.
- Tail-spot Corydoras✅ CompatiblePeaceful · 3 cm · Easy care · 22–28 °C (72–82 °F)
- Both are peaceful; temperature, pH and hardness ranges all overlap and neither outsizes the other enough to be a threat.
- Keep Tail-spot Corydoras in a shoal of 8+ or it gets stressed and nippy.
- Black Darter Tetra⚠️ With cautionSemi-aggressive · 4 cm · Hard care · 21–28 °C (70–82 °F)
- Different pH ranges (7–8 vs 3.5–6.5); doable if you sit in the shared band, but not ideal long-term.
- Water hardness preferences differ (Red Lip Nerite Snail 6–18 vs Black Darter Tetra 0–5 dGH).
- Black Ruby Barb⚠️ With cautionSemi-aggressive · 6 cm · Easy care · 22–26 °C (72–79 °F)
- Black Ruby Barb may bully the smaller Red Lip Nerite Snail, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Your 75 L tank is below the ~100 L this pairing really wants — crowding raises aggression.
- Keep Black Ruby Barb in a shoal of 6+ or it gets stressed and nippy.
- Chocolate Gourami⚠️ With cautionPeaceful · 5 cm · Hard care · 25–30 °C (77–86 °F)
- Different pH ranges (7–8 vs 4–6); doable if you sit in the shared band, but not ideal long-term.
- Water hardness preferences differ (Red Lip Nerite Snail 6–18 vs Chocolate Gourami 0–5 dGH).
- Keep Chocolate Gourami in a shoal of 6+ or it gets stressed and nippy.
- Crimson Red Betta⚠️ With cautionPeaceful · 3.5 cm · Hard care · 24–29 °C (75–84 °F)
- pH preferences only just meet (Red Lip Nerite Snail 7–8 vs Crimson Red Betta 4–6.5) — target the overlap and acclimate slowly.
- One likes softer water and the other harder (6–18 vs 0–5 dGH) — a compromise, not a perfect match.
- Crystal Red Shrimp⚠️ With cautionPeaceful · 2.5 cm · Hard care · 20–24 °C (68–75 °F)
- pH preferences only just meet (Red Lip Nerite Snail 7–8 vs Crystal Red Shrimp 6–6.8) — target the overlap and acclimate slowly.
- One likes softer water and the other harder (6–18 vs 2–5 dGH) — a compromise, not a perfect match.
- Keep Crystal Red Shrimp in a shoal of 10+ or it gets stressed and nippy.
- Fire Red Licorice Gourami⚠️ With cautionPeaceful · 3.5 cm · Hard care · 23–28 °C (73–82 °F)
- pH preferences only just meet (Red Lip Nerite Snail 7–8 vs Fire Red Licorice Gourami 4–6.5) — target the overlap and acclimate slowly.
- One likes softer water and the other harder (6–18 vs 0–4 dGH) — a compromise, not a perfect match.
- Green Neon Tetra⚠️ With cautionPeaceful · 2.5 cm · Hard care · 24–28 °C (75–82 °F)
- Different pH ranges (7–8 vs 4.5–6.5); doable if you sit in the shared band, but not ideal long-term.
- Water hardness preferences differ (Red Lip Nerite Snail 6–18 vs Green Neon Tetra 0–4 dGH).
- Keep Green Neon Tetra in a shoal of 8+ or it gets stressed and nippy.
- Humpbacked Tetra⚠️ With cautionSemi-aggressive · 5 cm · Hard care · 24–28 °C (75–82 °F)
- Humpbacked Tetra may bully the smaller Red Lip Nerite Snail, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Humpbacked Tetra in a shoal of 8+ or it gets stressed and nippy.
- Morse Code Corydoras⚠️ With cautionPeaceful · 5 cm · Medium care · 23–26 °C (73–79 °F)
- Your 75 L tank is below the ~80 L this pairing really wants — crowding raises aggression.
- Keep Morse Code Corydoras in a shoal of 6+ or it gets stressed and nippy.
- Neon Blue Rasbora⚠️ With cautionPeaceful · 2.5 cm · Medium care · 23–26 °C (73–79 °F)
- pH preferences only just meet (Red Lip Nerite Snail 7–8 vs Neon Blue Rasbora 4–6.5) — target the overlap and acclimate slowly.
- Keep Neon Blue Rasbora in a shoal of 10+ or it gets stressed and nippy.
- Purple Tetra⚠️ With cautionPeaceful · 4 cm · Medium care · 22–26 °C (72–79 °F)
- Different pH ranges (7–8 vs 5.8–6.8); doable if you sit in the shared band, but not ideal long-term.
- Keep Purple Tetra in a shoal of 8+ or it gets stressed and nippy.
- Silvertip Tetra⚠️ With cautionSemi-aggressive · 5 cm · Easy care · 22–28 °C (72–82 °F)
- Silvertip Tetra may bully the smaller Red Lip Nerite Snail, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Keep Silvertip Tetra in a shoal of 6+ or it gets stressed and nippy.
- Spotfin Betta⚠️ With cautionSemi-aggressive · 5 cm · Medium care · 23–28 °C (73–82 °F)
- pH preferences only just meet (Red Lip Nerite Snail 7–8 vs Spotfin Betta 4–6.5) — target the overlap and acclimate slowly.
- One likes softer water and the other harder (6–18 vs 0–5 dGH) — a compromise, not a perfect match.
- Spotfin Betta may bully the smaller Red Lip Nerite Snail, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Striped Red-Eye Puffer⚠️ With cautionAggressive · 5 cm · Hard care · 24–28 °C (75–82 °F)
- Striped Red-Eye Puffer may bully the smaller Red Lip Nerite Snail, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
- Tucano Tetra⚠️ With cautionPeaceful · 1.7 cm · Hard care · 23–28 °C (73–82 °F)
- Different pH ranges (7–8 vs 4.5–6.5); doable if you sit in the shared band, but not ideal long-term.
- Water hardness preferences differ (Red Lip Nerite Snail 6–18 vs Tucano Tetra 1–5 dGH).
- Keep Tucano Tetra in a shoal of 10+ or it gets stressed and nippy.
- Wine Red Betta⚠️ With cautionAggressive · 5 cm · Medium care · 24–28 °C (75–82 °F)
- Different pH ranges (7–8 vs 4–6.5); doable if you sit in the shared band, but not ideal long-term.
- Water hardness preferences differ (Red Lip Nerite Snail 6–18 vs Wine Red Betta 0–4 dGH).
- Wine Red Betta may bully the smaller Red Lip Nerite Snail, though its armour makes it a hard meal — give it caves and driftwood to retreat into.
Compatibility is computed from each species' care data — a strong starting point, not a guarantee. Individual temperament varies, so always introduce new fish slowly and watch them.
Red Lip Nerite Snail care specs
- Care level
- Easy
- Breeding
- Very Hard
- Max size
- 2 cm (0.8 in)
- Min tank size
- 38 L (10 gal)
- Temperature
- 22–28 °C (72–82 °F)
- pH
- 7–8
- Hardness
- 6–18 dGH
- Lifespan
- 2–4 years
- Diet
- Herbivore
- Swim level
- Bottom
- Group size
- Best alone or in a pair
- Family
- Neritidae
- Origin
- Indo-Pacific — Indonesia, Philippines and surrounding coastal regions
What is a Red Lip Nerite Snail?
The Red Lip Nerite Snail (Neritina violacea), also sold as the violet nerite or Darwin nerite, is a compact Indo-Pacific gastropod that has earned a loyal following in the freshwater hobby. Topping out at just 2 cm (0.8 in) across the shell, it is small enough for desktop nano tanks yet puts in a full shift as an algae cleaner — methodically grazing film algae, diatoms and green spot algae from glass, rocks and hardscape. What makes this species stand out from the many nerites available is its highly variable dark shell — ranging from near-black to dark olive with spots, streaks or irregular stripes — and the vivid red-orange inner lip of the aperture that gives it its name. Keep the water moderately hard and alkaline, and a Red Lip Nerite will reward you with years of low-maintenance, high-impact cleaning duty.
Where do Red Lip Nerite Snails come from?
Neritina violacea originates from the Indo-Pacific coastal belt, with wild populations recorded across Indonesia, the Philippines and surrounding island regions. Like most nerite species, it inhabits the transitional zone between fresh and brackish water — river mouths, tidal streams and coastal mangrove edges where the water is warm, mineral-rich and subject to tidal mixing. This amphibious lifestyle explains two defining traits: a tolerance for moderately hard, neutral-to-alkaline freshwater, and a breeding cycle that depends on brackish or marine conditions. Most specimens in the trade have been wild-collected and passed through a brackish larval stage before reaching your fish store.
What tank setup and size do Red Lip Nerite Snails need?
A 38-litre (10-gallon) tank is the practical starting point, and it will comfortably house a small group of three to five snails while giving them enough grazing surface to sustain themselves. Larger tanks are naturally easier to keep stable and provide more hard surface area for the snails to work.
Hard, textured surfaces are more important than floor space: glass, polished river stones, slate and ceramic hardscape are where these snails spend most of their time. Dense planting is appreciated but not essential — they do not eat healthy plant tissue. A tight-fitting lid is mandatory; nerites are persistent climbers and will wander above the waterline and dry out on the floor. Gentle to moderate filtration is fine. Avoid copper-based treatments or fertilisers — copper is lethal to all invertebrates at very low concentrations.
What water parameters do Red Lip Nerite Snails need?
- Temperature: 22–28 °C (72–82 °F)
- pH: 7.0–8.0 — neutral to moderately alkaline
- Hardness: 6–18 dGH — moderate to hard
The hardness range is non-negotiable. Calcium and magnesium in hard water are the building blocks of the shell; in soft or acidic conditions (pH below 7.0, hardness below 6 dGH) the shell slowly pits and dissolves, cutting lifespan well below the 2–4-year potential. If your tap water is soft, crushed coral in the filter will buffer both pH and hardness. Weekly water changes of 20–25% keep nitrates down and parameters stable; sudden swings can cause the snail to retract for days at a time.
What do Red Lip Nerite Snails eat?
Red Lip Nerite Snails are pure herbivores. Their preferred food is algae in all its thin, adherent forms: green film algae and diatoms on glass, brown diatom film on substrate and decor, and green spot algae on slow-growing plant leaves. A well-established tank with a moderate algae load is the ideal environment.
In a clean, newly set-up tank with little algae, supplement with sinking algae wafers, blanched courgette (zucchini) or cucumber, or nori sheets clipped near the bottom. Without supplemental food a snail in a clean tank will slowly starve. Do not worry about them eating live, healthy plant tissue — they will not. If you notice a snail has been motionless for more than 48 hours, check for signs of life (retraction reflex, smell) and ensure adequate food is available.
What is the behaviour and temperament of Red Lip Nerite Snails — and what are good tank mates?
Red Lip Nerite Snails are entirely peaceful and make no demands on other tank residents. They graze methodically across hard surfaces, resting in one spot for hours before moving on, and pose no threat to fish, shrimp or other invertebrates.
Because they are so docile, the compatibility question is really about what might bother the snails. Avoid large cichlids, pufferfish, loaches and assassin snails — species that eat snails or crack shells. Peaceful community fish such as tetras, rasboras, corydoras, small plecos and livebearers coexist without issue. Dwarf shrimp (neocaridina and caridina) are ideal neighbours; both occupy the bottom zone and benefit from the same clean, hard water.
For a complete rundown of compatible species, see Red Lip Nerite Snail tank mates.
How do you tell male from female Red Lip Nerite Snails apart?
There is no reliable external method for sexing Neritina violacea. Shell shape, size and coloration do not consistently differ between males and females, and even experienced collectors cannot sex live nerites by sight. The only indicator of sex is internal anatomy. In practice this does not matter: the snails will not reproduce in freshwater regardless of the sex ratio, so there is no reason to seek a particular mix. Buy however many you need for algae control and leave it at that.
Can Red Lip Nerite Snails breed in a home aquarium?
Breeding is rated Very Hard for one fundamental reason: the larvae require brackish or marine water to survive. Adults will mate in freshwater, and females lay small, hard white eggs on any firm surface — glass, driftwood, rocks, equipment. These eggs are persistent and difficult to remove, but they will not hatch in freshwater. Without the salinity gradient of a tidal estuary the larvae cannot develop. This is why nerites are prized over other snails — algae-eating ability with zero risk of population explosion. Intentional breeding would require a dedicated brackish rearing system and expertise well beyond typical aquarium keeping.
What are common diseases affecting Red Lip Nerite Snails?
Nerite snails are hardy by invertebrate standards, but several problems do arise in captivity:
Shell erosion and pitting is the most common issue and is caused directly by soft, acidic water. The shell surface becomes rough, develops white patches or holes, and in severe cases the snail loses structural integrity. Prevention is straightforward: maintain pH above 7.0 and hardness above 6 dGH.
Copper toxicity is acutely lethal. A single dose of many common fish medications, or copper-based algaecides, will kill nerites within hours. Always check medication labels and remove snails to a separate container before treating the main tank.
Starvation looks like prolonged inactivity and a snail that refuses to move even when disturbed. Ensure algae or supplemental foods are available at all times.
Failed acclimation — usually shown by a snail that retracts immediately and does not emerge for several days — is often caused by a rapid pH or hardness change during the transition from store water to tank water. Drip acclimation over 30–60 minutes greatly reduces this risk.
Health note: disease diagnosis and medication dosing are beyond the scope of a care profile. For a snail that is not recovering, consult a reputable invertebrate health resource before introducing any chemical treatment to the tank.
How long do Red Lip Nerite Snails live?
With good water quality, adequate food and no copper exposure, Neritina violacea lives 2–4 years. Shell condition is the clearest health indicator: a smooth, intact shell with a vivid red-orange lip means the water chemistry is right. Most sold specimens are wild-caught adults of unknown age, so some of that lifespan may already have passed. Focus on stable, hard, alkaline water from the start and you will get the best years out of them.
Frequently asked questions
Will Red Lip Nerite Snails breed in my freshwater tank?
No. Like all nerite snails, their larvae require brackish or marine water to develop. Adults lay tiny white eggs on hard surfaces but the eggs will not hatch in fresh water, so population explosions are impossible — a key reason nerites are so popular with aquarists.
Is the Red Lip Nerite different from the common Zebra Nerite or Neritina natalensis?
Yes. Neritina violacea is a distinct species from the Indo-Pacific, distinguished by its highly variable dark-patterned shell and the striking red-orange inner lip of the aperture. Neritina natalensis originates from East Africa and has a different shell shape and lip colour. Both share the same freshwater-safe, non-reproducing trait.
What you need to keep a red lip nerite snail
The baseline is a heated, filtered 38 L+ tank: a reliable heater to hold 22–28 °C (72–82 °F), a gentle filter that won't batter a red lip nerite snail in the current, and a tight-fitting lid. Cycle the tank fully before adding any fish.
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