Nerite Snail Care: Algae Eating, Eggs and Tank Setup

Nerite snails (family Neritidae) are the aquarium snails that clean algae without ever overpopulating a freshwater tank: their eggs need brackish water to hatch. The popular zebra nerite (Neritina natalensis), olive nerite and horned nerites stay around 0.5-1 inch (1.5-2.5 cm) and are among the best algae eaters for glass, rocks and hardscape.

Photo: H. Zell - Wikimedia Commons, CC BY-SA 3.0

Parameter	Value
Common types	Zebra (Neritina natalensis), olive, tiger, horned nerites
Adult size	0.5-1 in (1.5-2.5 cm)
Lifespan	1-2 years, sometimes longer
Temperature	72-78°F (22-26°C)
pH	7.0-8.0
Breeds in freshwater?	No - eggs need brackish water
Diet	Film algae, green spot algae, biofilm

Why Nerites Are Popular Algae Eaters

Nerite snails graze hard surfaces constantly and remove green film and green spot algae that many fish ignore. They leave live plants alone. Because they do not reproduce in freshwater, a group of three or four stays a group of three or four.

The White Dots on Your Glass

Female nerites still lay eggs: small, hard white capsules scattered on glass, wood and rocks. They will not hatch in freshwater, but they stick firmly and can be hard to scrape off driftwood. This is the main downside of keeping nerites in a display tank.

Keeping Nerites Alive

• Acclimate slowly: drip acclimation over 30-60 minutes; nerites are sensitive to sudden changes
• Use a lid: nerites climb out and dry up
• Feed algae wafers once algae runs low, or they starve in a very clean tank
• A snail on its back may not right itself; turn it over gently
• Keep pH above 7 for shell health

Nerite Snails vs Other Snails

Compared with ramshorn snails, nerites do not breed; compared with apple snails, they are smaller and produce far less waste. For a tank where you want algae control and no snail population, nerites are the usual choice.

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