Nerite Snail Varieties Complete Guide: Zebra, Horned, Tiger
Nerite snails solve the algae problem without breeding out of control, which is why they have become the default cleanup crew in Singapore planted tanks. Several visually distinct species share the trade name — zebra, horned, tiger, red-spotted, olive — with slightly different care and sourcing quirks. This nerite snail varieties complete guide from Gensou Aquascaping at 5 Everton Park covers the common species, algae performance, calcium needs and where to source them locally. Start with a look at the livestock catalogue for current snail availability.
The Key Species
Zebra nerite (Neritina natalensis) — 2-3 cm, black and yellow banded shell, the most algae-hungry and widely available. Horned nerite (Clithon corona) — 1-1.5 cm, black with yellow accents and distinctive shell horns, best for nano tanks. Tiger nerite (Vittina semiconica) — 2-3 cm, mottled tiger-stripe pattern, moderate algae eater. Red-spotted or red-racer nerite (Neritina natalensis variant) — 1.5-2.5 cm with red spot patterning. Olive nerite (Neritina reclivata) — uniform olive green, a strong glass-cleaner.
Why They Cannot Overpopulate
Nerites lay small white egg capsules on hard surfaces, but the eggs require brackish or fully marine water to hatch. In pure freshwater the eggs stay dormant, do not reproduce and eventually disintegrate. This makes nerites the only truly population-stable snail for freshwater tanks — a stark contrast to ramshorn or bladder snails. The egg dots can be cosmetically annoying but cause no biological issue.
Algae Performance Ranking
Zebra and olive nerites are the strongest generalists — they grind through green spot algae, diatoms and soft film. Horned nerites reach into crevices that larger species cannot. Tiger nerites handle brown diatom phases well. Red-spotted nerites are more decorative than workhorse. For a 60-litre planted tank, three to five nerites of any mixed species handle regular maintenance algae; heavy outbreaks still require root-cause correction from the water care range.
Calcium and Shell Health
Nerite shells erode pitting and thinning in very soft acidic water. Singapore tap water sits on the low-GH side, so supplement calcium via crushed coral in the filter, cuttlebone in the tank, wondershell or calcium-rich substrate additive. Maintain KH above 3 to buffer against pH swings that dissolve shells. Shell damage is permanent — the eroded section does not regrow.
Tank Size and Stocking Rate
One nerite per 20-30 litres is the accepted rule for most freshwater tanks. Overstocking leads to starvation once algae is cleared, at which point nerites need supplemental feeding — blanched zucchini, cucumber or algae wafers. Tanks smaller than 20 litres suit horned nerites only, as the larger zebra and tiger varieties need more foraging area.
Water Parameters
Target 22-28°C, pH 7.0-8.0, GH 6-12, KH 4-8, ammonia and nitrite zero, nitrate under 20 ppm. Nerites prefer slightly harder, more alkaline water than most tropical fish — a compromise band of pH 7.0-7.3 suits mixed community tanks. Avoid copper-based fertilisers and medications, which are lethal to all invertebrates including nerites.
Tank Mate Considerations
Safe with tetras, rasboras, corys, peaceful barbs, dwarf shrimp, bettas (most), gouramis and plecos. Avoid assassin snails (which eat nerites), loaches (yoyo, clown, skunk — all crack snail shells with pharyngeal teeth) and pufferfish. Crayfish and large cichlids will also damage or kill nerites.
Flipping and Rescue
Nerites sometimes fall onto their backs and cannot right themselves, particularly on smooth substrate. A stranded nerite dies within 24 hours in a typical tropical tank. Check twice daily in the first week after stocking and flip any upside-down snail — they recover instantly. Rough surfaces and driftwood give them better traction than bare glass.
Sourcing in Singapore
Zebra and horned nerites are universally stocked at Y618, C328 Clementi, Polyart Joo Chiat, Seaview and most LFS. Expect SGD 2-4 per zebra and SGD 1.50-3 per horned. Tiger and red-spotted appear less often and run SGD 3-6. Olive nerites are a rarer special-order item at SGD 2.50-4. Shopee listings from local sellers match LFS pricing; Carousell occasionally carries bulk lots.
Escape Prevention
Nerites climb above the waterline and can walk out of open tanks. A tight-fitting cover or the top half-centimetre of the rim kept consistently wet prevents escapes. Dried-out nerites rehydrate occasionally but mortality is high past 12 hours. Check routinely behind HOB filter boxes and under lids.
Lifespan
Expect 1-3 years depending on species, with zebra nerites reaching the upper end in stable calcium-rich water. Shorter-than-expected lifespans usually trace to copper exposure, shell erosion from soft water or stranded-upside-down incidents. None of these are species failures — they are husbandry issues, and the nerite snail varieties complete guide is really a husbandry checklist.
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