Turtle Nerite Snails are one of the most visually distinctive Nerite varieties available — a compact snail with a domed, olive-green shell marked by fine dark ridges and lines that create a texture pattern closely resembling the scute structure of a turtle carapace. The green base coloration is warmer and more subdued than the high-contrast patterns of Zebra or Tiger Nerites, with the ridge detailing adding surface interest that plain-shelled varieties lack. Like all Nerites, they are the most effective algae cleaners in the catalog — consuming green spot algae, green dust algae, brown diatom algae, and biofilm from glass, hardscape, and plant leaves with a thoroughness that no other commonly kept snail matches. And like all Nerites kept in freshwater, they cannot successfully reproduce in the tank: eggs may be laid on hardscape and glass but require brackish water to hatch, making the population completely self-limiting. Fully safe with all Neocaridina and Caridina shrimp. Does not eat healthy plant tissue.
7.0–8.0pH
6–15GH (dGH)
3–12KH (dKH)
65–80°FTemperature
What to Expect
Appearance, Behaviour & Cleaning Performance
Rich olive-green shell with fine dark ridge patterning — the shell base is a warm, muted olive-green — a colour that reads as natural and understated rather than vivid, which makes the fine dark ridge patterning across the shell surface more apparent by contrast. The ridges follow the growth lines of the shell and create a subtly textured surface that catches light differently at different angles, giving the snail a more three-dimensional visual character than smooth-shelled varieties. No two shells are identical in their ridge pattern, making each individual subtly distinct. Most effective algae cleaners in the catalog — particularly green spot algae — Nerites are the benchmark algae-cleaning snail against which all others are measured, and the Green Turtle is no exception. They consume green spot algae — the hard, adherent disc-shaped algae that forms on glass and hardscape and that most snails and shrimp cannot remove — as their primary food. They also consume green dust algae, brown diatom films, and biofilm from every surface they can access. A single Nerite in a 20-litre nano tank keeps glass noticeably cleaner than any other snail of equivalent size. Cannot breed in freshwater — population is permanently fixed — Nerites lay small, white, sesame-seed-shaped eggs on hardscape, driftwood, and glass — visible and sometimes numerous, particularly shortly after introduction. The eggs cannot hatch in freshwater and will eventually dissolve or be consumed by other tank inhabitants. This means the Nerite population can never increase in a freshwater tank, making them the only commonly available algae-cleaning snail where overpopulation is impossible. The number you introduce is the number you will always have. Compact, domed shell — accesses tight surfaces — the compact, low-domed shell profile allows Green Turtle Nerites to access surfaces and tight spaces that larger or more elongated snails cannot reach — under plant leaves, in narrow hardscape gaps, and along the substrate-glass junction. The shell is thick and hard-wearing, resisting damage from tumbling in strong current or falling from hardscape more readily than thin-shelled snail species. Requires adequate GH and KH for shell integrity — Nerite shells require dissolved calcium and carbonate hardness to maintain their thickness, colour, and the distinctive ridge patterning. In very soft or acidic water the shell surface erodes and pits — a condition that dulls the olive-green colour and obscures the ridge detail. Maintain pH at 7.0 or above and GH at 6 or above for healthy, clearly patterned shells throughout the snail's life. Does not eat healthy plant tissue — Nerites consume algae and biofilm from plant leaf surfaces without damaging the leaf tissue itself. They are observed frequently on plant leaves and this contact is beneficial — algae and biofilm removed from leaf surfaces improves light penetration to the leaf and reduces the surface competition that favours algae over plant health.
How to Set It Up
Getting Started
1Acclimate carefully to avoid shell shock — float the bag for 15 minutes to temperature-equalise, then drip or gradually add tank water over 20–30 minutes before release. Nerites are sensitive to sudden parameter shifts — particularly from soft to hard water or vice versa — during acclimation. The slower the transition, the less stress on the shell and the animal.
2Stock at one to two per 10 litres in planted tanks — in a well-planted tank with moderate light and standard shrimp feeding, one to two Green Turtle Nerites per 10 litres provides thorough algae control without the snails depleting their food source and going hungry. In tanks with algae problems or higher light driving faster algae growth, slightly higher stocking is appropriate.
3Ensure tank is fully cycled and parameters are stable — Nerites are more sensitive to parameter instability than Ramshorns or Bladder Snails. Introduce only to fully cycled tanks with stable pH, GH, and KH. Ammonia or nitrite in the water column, or rapid pH fluctuations, cause stress that manifests as shell etching and withdrawal into the shell for extended periods.
4Maintain GH at 6 or above for shell health — in soft water tanks supplement GH with a GH+ mineral or place a small piece of cuttlebone in the filter. This benefits shrimp mineral requirements simultaneously and maintains the olive-green colour and ridge definition that make the Green Turtle Nerite visually distinctive over the long term.
💡 Bonus Tip
Green Turtle Nerites placed in a new tank during initial setup — before the first algae growth — do not have sufficient food and may go hungry or attempt to escape the tank. Introduce Nerites only after algae has begun developing on glass and hardscape surfaces, or supplement with blanched zucchini or spirulina wafers while the tank matures. A Nerite that has adequate algae to graze rarely attempts escape; one without food will reliably try to climb out.
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Browse more freshwater snails
Pair Green Turtle Nerites with Ramshorns, Bladder Snails, or Mystery Snails for a complete cleanup crew. Browse our Freshwater Snails collection.
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