Nerite snails are the best algae-eating snail for a UK aquarium — they devour green spot and diatom algae, are completely peaceful, and, crucially, cannot reproduce in freshwater, so they never overrun the tank like pest snails do. A few nerites are the low-maintenance cleanup crew almost every community tank benefits from.
Here is how to keep them.
- Nerite snails are the best algae-eating snail and cannot breed in freshwater, so they never overrun the tank.
- They eat green spot and diatom algae that many other cleaners ignore.
- They need adequate hardness and calcium for a healthy shell, and a lid to stop them climbing out.
- Never use copper medications, which are fatal to snails.
Quick facts
- Adult size: 2–2.5 cm
- Tank size: any, from nano upward
- Water: pH 7.0–8.5, medium to hard, 22–28 °C
- Lifespan: 1–2 years
- Breeding: lay eggs but cannot hatch in freshwater
Why nerites don't overrun the tank
Unlike bladder and ramshorn snails, nerites need brackish water for their eggs to hatch. In a freshwater tank they may lay small white eggs on hard surfaces, but these never hatch — so the population stays exactly where you want it. This is why they are the go-to snail for algae control without the pest problem, unlike the snails covered in how to get rid of snails.
Care and feeding
Nerites graze algae off glass, rocks and plants all day. In a clean tank with little algae, supplement with algae wafers or blanched vegetables. They need adequate hardness (GH) and calcium for a healthy shell — see what is GH.
Fit a lid — nerites climb out of open tanks. And never dose copper medications, which kill snails and shrimp.
Tank mates
Safe with virtually everything peaceful — a favourite in shrimp and community tanks. Avoid pufferfish, loaches and large cichlids that eat snails.
Frequently asked questions
Do nerite snails multiply in a fish tank?
No. Nerite snails need brackish water for their eggs to hatch, so in a freshwater tank the population never increases — they are the best snail for algae control without overrunning the tank.
What do nerite snails eat?
Mainly algae — green spot and diatom algae grazed off glass, rocks and plants. In a clean tank supplement with algae wafers or blanched vegetables.
Why do my nerite snails keep dying?
Usually inadequate hardness and calcium for shell health, copper in the water, or an immature tank with too little algae. Ensure medium-to-hard water and never dose copper medications.
— Jaqline Smalling, FishForever
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