Olive Nerite Snails (Neritina reclivata) are a smooth-shelled freshwater nerite with a subtly beautiful natural shell -- a rounded, elongated oval in muted olive-green to yellow-tan tones, sometimes showing faint banding or speckling that varies between individuals. Where Zebra Nerites and Horned Nerites carry bold graphic shell patterns, Olive Nerites carry a quieter, more naturalistic shell aesthetic that reads as a considered, understated addition to a planted or hardscape tank rather than a pattern statement. The shell surface is smooth and rounded with a low spire, giving each snail a clean, streamlined profile against driftwood and stone. In terms of function they perform identically to all other nerite species: exceptional continuous algae grazing across every tank surface, zero population expansion in freshwater, and complete safety with all shrimp and other invertebrates. Olive Nerites are one of the more actively moving nerites -- they cover substantial surface area per day and are frequently visible on glass, driftwood, broad plant leaves, and substrate simultaneously across the course of a single day. Safe with all Neocaridina, Caridina, and other snails.
What to Expect
Shell, Grazing and Behaviour
Smooth olive-green to tan shell with a naturalistic muted aesthetic -- the shell of Olive Nerites is a smooth, elongated oval with a low spire and a muted colour palette in the olive-green to yellow-tan range -- sometimes nearly uniform in colour, sometimes showing faint irregular banding or speckling that varies between individuals. The smooth surface and rounded profile read as clean and naturalistic against hardscape and plant backgrounds, complementing a planted tank aesthetic without competing with it. The shell does not carry the high-contrast graphic patterning of Zebra or Tiger Nerites -- its appeal is in its quiet, natural quality rather than its visual boldness.
Exceptional continuous algae grazing -- the primary function of all nerites -- Olive Nerites graze algae from every tank surface continuously throughout the day: glass panels, driftwood surfaces, stone, broad plant leaves including Anubias, and substrate. The rasping movement of the radula across surfaces is visible at close range and the cleaned path left behind on glass is immediately apparent after a nerite has passed. In a tank with moderate algae accumulation, a small group of Olive Nerites produces visibly cleaner glass and hardscape surfaces within one to two weeks of introduction.
Cannot breed in freshwater -- population stays exactly at introduction number -- nerite larvae require brackish or marine water to develop. No breeding occurs in a standard freshwater tank, and no eggs develop into juvenile snails regardless of how many eggs are laid. The number of Olive Nerites introduced is the number you will have indefinitely. The white calcified eggs that nerites deposit on hardscape and glass are the only evidence of reproductive activity in freshwater and are harmless, though they can be difficult to remove once fully calcified.
Stable population -- stock to the required grazing load and leave it there -- because Olive Nerites cannot reproduce in freshwater, population management is entirely in the keeper's control. The recommended stocking rate is one nerite per 10-15 litres for maintenance-level grazing in a tank with moderate light and good plant growth. In tanks with persistent algae problems, stock at the higher end temporarily; in well-balanced planted tanks, the lower end of the range provides adequate maintenance grazing without overgrazing the biofilm surfaces that shrimp depend on.
GH 6+ is required for shell health and integrity -- nerite shells, like all snail shells, require adequate dissolved calcium for maintenance and growth. In water with GH below 6, shell erosion appears as pitting, thinning, or white chalky patches on the shell surface, typically beginning at the spire and progressing toward the aperture. In GH 6+ water the smooth olive-tan shell maintains its integrity and natural lustre throughout the snail's life. In Caridina tanks with soft, low-GH water, monitor shell condition closely and supplement with cuttlebone or crushed coral if erosion is observed.
Active across all surfaces throughout the day -- frequently visible -- Olive Nerites are among the more active nerite species in terms of the surface area they cover per day. It is typical to find individuals on the front glass in the morning, on driftwood at midday, and on the substrate surface or rear glass in the evening -- a full circuit of the tank in the course of a single day. This continuous movement makes them reliably visible and engaging rather than spending long periods hidden or inactive.
How to Set It Up
Getting Started
1Confirm GH 6+ before introduction -- test GH before adding Olive Nerites. In tanks with GH below 6, supplement with a GH-raising mineral or add cuttlebone to the tank before introduction to support shell integrity from day one.
2Float acclimate for 15-20 minutes -- nerites are less sensitive to parameter transitions than shrimp but still benefit from temperature equalisation. Float the bag for 15-20 minutes before release. A brief drip of 15-20 minutes is an optional additional step that reduces stress further.
3Stock at one per 10-15 litres for maintenance grazing -- introduce the number appropriate to the tank volume and the current algae load. In a new tank with little algae, supplement with algae wafers or blanched vegetables until tank algae establishes. Nerites that cannot find sufficient algae in a new tank will starve.
4Cover the tank -- nerites escape readily and do not survive out of water -- Olive Nerites climb above the waterline and will exit an uncovered tank. Ensure all openings including filter return gaps, surface skimmer slots, and lid gaps are covered or blocked. A nerite found outside the tank will not survive unless returned to water quickly.
Bonus TipOlive Nerites are one of the most practically effective snails for cleaning broad-leafed plants -- Anubias, Cryptocoryne, and Java Fern all develop algae on their broad leaf surfaces that is difficult to address without disturbing the plants or scrubbing leaves manually. Olive Nerites move across broad leaf surfaces readily, rasping algae from the leaf face without damaging the leaf tissue, and their smooth rounded shell profile allows them to navigate between dense plant arrangements without dislodging leaves from their attachment points on hardscape. A single Olive Nerite working across an established Anubias plant cleans the leaf surfaces more completely and more gently than any manual intervention.
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Browse more freshwater snailsPair Olive Nerites with Zebra Nerites, Mystery Snails, or Ramshorns for a complete cleanup crew. Browse our Freshwater Snails collection.
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