Nerite snail care guide
Also called: Zebra nerite snail, Zebra nerite, Tiger nerite, Olive nerite, Horned nerite, Racer nerite, Black racer nerite, Nerite, Neritina natalensis
Nerite snails are small, patterned snails that scrape algae off glass, rocks and leaves without harming plants. Their eggs can't hatch in fresh water, so they never overrun a tank, but they need hard water, enough algae to eat and a tight lid.
Nerite snails need a tank of at least 5 gallons (19 L), and water at 22–27°C (72–81°F) with a pH of 7–8. They grow to about 2.5 cm (1 in) and are peaceful.
Plan a tank with nerite snailsSee all tank mates
Nerite snail quick facts
| Scientific name | Neritina natalensis |
|---|---|
| Family | Neritidae |
| Origin | Coastal rivers, estuaries and mangroves of eastern Africa (zebra nerite); other nerites in the trade come from Asia and the Americas |
| Adult size | 2.5 cm (1 in) |
| Minimum tank | 5 gallons (19 L) |
| Temperature | 22–27°C (72–81°F) |
| pH | 7–8 |
| Hardness (GH) | 8–15 dGH |
| Group size | Can live alone |
| Temperament | Peaceful |
| Swims at | All levels |
| Diet | Herbivore (mostly plants and algae) |
| Care level | Easy |
| Lifespan | 1–3 years |
| Safe with plants? | Yes |
- Known jumper: keep a tight-fitting lid.
Tank setup
One snail can live in a 5-gallon (19 L) tank, and about one nerite per 5 gallons is a good rule for algae control. Some keepers use 2–3 gallon nanos, but those grow little algae and swing quickly in temperature and water quality. A mature tank with some algae suits them best, because a brand-new, spotless tank leaves them little to eat. Keep a tight lid and close any gaps, since nerites often crawl out above the waterline.
How many nerite snails in a tank?
The smallest common tank that suits nerite snails is a 5 gallon. Here is roughly how many fit in each size when they are the only fish, based on adult size and waste output. Leave room if you want tank mates.
| Tank | Nerite snails (alone) |
|---|---|
| 3 gallon | Too small |
| 5 gallon | Up to 45 |
| 10 gallon | Up to 91 |
| 15 gallon | Up to 137 |
| 20 gallon | Up to 183 |
| 20 gallon long | Up to 183 |
| 29 gallon | Up to 266 |
| 40 gallon | Up to 367 |
| 55 gallon | Up to 505 |
| 75 gallon | Up to 689 |
| 125 gallon | Up to 1149 |
What you need for nerite snails
Sized for a 5 gallon tank, the smallest common size that suits nerite snails. For a different tank or a mix of fish, use the stocking calculator for a list sized to your plan.
Tank and equipment
- 5 gallon aquarium (tank or kit) (opens Amazon in a new tab)Bigger tanks are more stable and easier for beginners. How to choose
- Adjustable heater, 25 W (opens Amazon in a new tab)Holds about 76 °F (24.5 °C) in a room at 68 °F (20 °C). A bigger heater can overheat a small tank if it sticks on. How to choose
- Aquarium thermometer (opens Amazon in a new tab)Check it daily: heaters can fail stuck on or off. How to choose
- Sponge filter for 10 gallons (opens Amazon in a new tab)Gentle flow, about 15–25 GPH, suits shrimp and snails, which prefer slow water. Needs a small air pump. How to choose
- About 15 lb of aquarium gravel (opens Amazon in a new tab)Enough for a layer about 2 in (5 cm) deep. Smooth gravel suits most community fish. How to choose
- Water conditioner (dechlorinator) (opens Amazon in a new tab)Removes chlorine and chloramine from tap water. Seachem Prime is a popular, concentrated choice. How to choose
- Liquid test kit (ammonia, nitrite, nitrate, pH) (opens Amazon in a new tab)Liquid kits are more accurate than strips. The API Freshwater Master Test Kit is the common choice. How to choose
- Gravel vacuum (siphon) (opens Amazon in a new tab)Cleans the gravel and does the water change in one go. How to choose
- LED aquarium light, about 16 in long (opens Amazon in a new tab)Match the light to the tank length. Basic LEDs grow easy plants. How to choose
Food and extras for nerite snails
- Calcium-rich snail food (opens Amazon in a new tab)Snails need calcium to keep their shells healthy.
Product links go to Amazon search results. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Disclosure.
Water parameters
Keep them at 22–27 °C (72–81 °F), pH 7.0–8.0 and 8–15 dGH. Soft or acidic water slowly eats away the shell, leaving pits and cracks. Crushed coral or a mineral supplement helps in soft water. Copper medicines and fenbendazole dewormers kill snails, so keep them out of the tank.
Best tank mates for nerite snails
These popular species share nerite snails' water needs and temperament. See the full list of 118 good matches.
Betta fish
6.5 cm (2.6 in) · 24–28°C (75–82°F)
Cherry shrimp
3 cm (1.2 in) · 20–27°C (68–81°F)
Guppy
5 cm (2 in) · 22–27°C (72–81°F)
Dwarf gourami
7.5 cm (3 in) · 24–28°C (75–82°F)
Neon tetra
3.5 cm (1.4 in) · 21–25°C (70–77°F)
Panda corydoras
4.5 cm (1.8 in) · 21–25°C (70–77°F)
Bristlenose pleco
12 cm (4.7 in) · 22–26°C (72–79°F)
Bronze corydoras
7 cm (2.8 in) · 21–26°C (70–79°F)
Avoid keeping nerite snails with
- Oscar: Oscar eats snails, including nerite snails.
- Assassin snail: Assassin snail eats snails, including nerite snails.
- Clown loach: Clown loach eats snails, including nerite snails.
- Discus: They need different temperatures: Nerite snail 22–27°C (72–81°F), discus 28–30°C (82–86°F).
- Dojo loach: Dojo loach eats snails, including nerite snails.
- Electric yellow cichlid: Electric yellow cichlid eats snails, including nerite snails.
Feeding
They graze algae and biofilm all day, including tough green spot algae that many other cleaners ignore. Once the algae runs low, feed algae wafers or blanched zucchini so they don't starve. They don't eat healthy plants.
Behavior
Peaceful and happy alone. They are safe with fish, shrimp, other snails and plants. Avoid puffers, snail-eating loaches, crayfish, most crabs and assassin snails. A nerite that lands on its back can struggle to turn over, so flip it if you see it stuck.
Breeding
They don't breed in fresh water. Females lay small white egg capsules, like sesame seeds, on wood, rocks and glass, but the eggs need brackish or salt water to hatch. The capsules are tough to scrape off, which is the main downside. Sexes are separate and look alike.
Tips from experienced keepers
- Expect white egg dots on wood and rocks. They won't hatch, and a razor blade or scrub pad removes them from glass.
- Feed algae wafers or blanched vegetables once the algae is gone. Hungry nerites often climb out looking for food.
- Add crushed coral or a mineral supplement if your water is soft or shells look pitted.
- Keep the waterline a little below the rim and use a lid with no gaps.
- Remove a snail that hangs limp out of its shell or smells foul. A dead snail can spike ammonia fast.
Frequently asked questions
Do nerite snails reproduce in freshwater tanks?
No. Females lay white eggs in fresh water, but the eggs need brackish or salt water to hatch, so the population never grows on its own.
How many nerite snails should I keep per gallon?
About one nerite per 5 gallons (19 L) works well for algae control. More than that may starve once the algae is gone unless you add food.
Why do nerite snails climb out of the tank?
They naturally roam above the waterline, and hunger or poor water quality makes it worse. Keep a tight lid, test your water and make sure they have enough to eat.
Sources
We checked these references when writing this page. Values are for healthy long-term keeping, not survival limits. Last reviewed 2026-10-13. See our editorial policy.