Freshwater Snails
Red Lip Nerite Snail
An Indonesian Nerite with a dark, intricately marbled shell and a vivid red aperture -- the brightly coloured mouth of the shell that gives the species its common name and makes it immediately distinctive among freshwater snails.
Red Lip Nerite Snails (Neritina violacea) are an Indonesian Nerite species defined by the vivid red interior of the shell aperture -- the opening through which the snail's foot extends -- which contrasts sharply against the dark, intricately patterned shell exterior. The shell itself is highly variable between individuals, ranging from near-black to dark brown with irregular marbling, banding, or mottled markings that give each snail a unique appearance. The combination of the dark exterior and the bright red lip makes the Red Lip Nerite one of the most visually interesting Nerites available, with a colour contrast that reads clearly at close range and is unlike any other commonly kept freshwater snail. Long-lived for a Nerite species at up to 4 years. Cannot breed in freshwater. Effective continuous algae grazer across all tank surfaces. pH above 7.0 preferred for long-term shell health. One important handling note: due to the shape of the shell, Red Lip Nerites can have difficulty righting themselves if placed upside down -- always introduce them face down onto a hard surface.
Appearance
The Red Lip and the Variable Shell
Vivid red aperture contrasting against a dark, variably patterned shell exterior. The defining feature of Neritina violacea is the interior of the shell opening, which is a bright red to orange-red that is clearly visible when the snail is active and moving. This colour is structural and permanent -- it does not fade with age or change with water parameters. The contrast between the dark shell and the red lip is most visible from the front and side when the snail is fully extended and grazing.
Shell exterior is dark and highly variable -- near-black to dark brown with individual marbling and mottling. No two Red Lip Nerites have exactly the same exterior shell pattern. The base colouration ranges from near-black to dark warm brown, with irregular marbling, banding, or mottled dark markings distributed differently on every individual. The overall appearance of the shell exterior is dark and complex at close range, in contrast to the clean simplicity of Zebra or Tiger Nerite patterning.
Up to 1 inch at maturity -- long-lived at up to 4 years. Red Lip Nerites grow to approximately ¾ to 1 inch in shell diameter at maturity. Their lifespan of up to 4 years in well-maintained conditions makes them a longer-term investment than many other Nerite species and justifies the additional care attention their specific requirements demand.
Shell shape makes self-righting difficult -- always place face down when introducing. The profile of the Red Lip Nerite shell is more domed and rounded than some other Nerite species, which means a snail placed upside down may be unable to right itself without assistance. Always use aquarium tweezers or your fingers to place each snail face down on a hard surface when introducing it to the tank. Check on newly introduced snails for the first hour to ensure none are stranded inverted.
Behaviour & Care
Algae Grazing & Husbandry
Effective broad-spectrum algae grazer -- active across glass, hardscape, and plant surfaces. Red Lip Nerites graze continuously, consuming soft green film algae, brown diatom films, and biofilm from all available surfaces. They are particularly active on glass and smooth hardscape where algae accumulates most visibly. In a well-established tank with adequate algae and biofilm growth no supplemental feeding is required; in newer or cleaner tanks supplement with algae wafers or blanched vegetables. Some individuals are initially reluctant to accept prepared foods -- offer high-spirulina algae wafers and allow several days for the snail to begin feeding.
Cannot breed in freshwater -- population completely stable. Like all Nerite species, Red Lip Nerites require brackish water for larval development. White egg capsules may be deposited on hardscape, glass, and plant surfaces but will not hatch in freshwater. You will never have more Red Lip Nerites than you introduce.
pH above 7.0 preferred for long-term shell integrity and red lip colour quality. In water below pH 7.0 the shell is prone to erosion over time, degrading the dark exterior and potentially affecting the vivid red aperture. Maintain pH above 7.0 and GH 6+ consistently. Calcium supplementation is recommended in softer water. Standard Neocaridina parameters are ideal. Not recommended for Caridina tanks with active substrate and low pH.
Cover the tank and keep the water line low. Red Lip Nerites climb and will exit the water through any gap. Keep the water line at least 5 to 7cm below the rim or use a tight-fitting lid.
Stock 1 per 10L and keep nitrates below 20 ppm. Nerite Snails are sensitive to elevated nitrates. Regular water changes and appropriate stocking keep nitrates in a safe range. Fully safe with all Neocaridina and Caridina shrimp at every life stage.
Keeper's NoteThe red aperture of the Red Lip Nerite is most visible and most striking when the snail is actively grazing on the front glass -- the dark shell against the glass with the vivid red lip facing outward creates a display that draws attention at close range in a way that most snails do not achieve. A small group of three to five Red Lip Nerites on dark substrate with bright green planting shows both the dark shell exterior and the red lip most clearly, and the up-to-4-year lifespan means individual snails become familiar, long-term inhabitants of the tank rather than animals replaced annually.
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