Horned Nerite Snail (Clithon corona / diadema) – Live Freshwater Algae Eating Snail

A top algae-eating contender!

Few aquarium animals earn their place quite as decisively as the Horned Nerite Snail. Part living sculpture, part cleaning machine — this spiky, yellow and black patterned snail brings genuine visual character to any freshwater tank while putting in serious work scrubbing algae off glass, substrate, rocks, driftwood, and plant leaves. If you've battled green spot algae, diatoms, or hair algae, this bumble bee-looking snail is the one for the job.

Widely regarded as one of the single best algae-eating snails in the aquarium hobby, the Horned Nerite is also one of the most beginner-friendly invertebrates available — hardy, peaceful, and completely incapable of overpopulating your tank. In freshwater, their eggs will not hatch, which means you get all the cleaning benefits with none of the population explosion.

What Is a Horned Nerite Snail?

The name 'horned nerite snail' refers to two closely related species in the genus Clithon — Clithon corona and Clithon diadema — naturally found in freshwater and brackish habitats across islands in the south to southwest Pacific.

Horned Nerite Snails are strongly polymorphic — no two snails look exactly alike. Shell coloration, spine length, patterning, and spiral markings vary between individual snails even within the same population. What they all share is the defining feature that gives them their name: a series of dark spiky horns protruding from the shell, ranging from short stubby points to longer, dramatic spines. The shell itself is typically golden-yellow with bold black spiral swirling — striking against both light and dark substrates.

They are far less likely to attract fin-nipping behavior than snails with longer appendages.

Why Aquarists Choose Horned Nerite Snails

• Exceptional algae eaters: actively scrub green spot algae, diatoms, hair algae, and biofilm from glass, hardscape, and plant leaves
• Will not reproduce in freshwater: population stays completely under your control
• Each snail is uniquely patterned: no two look identical, making every snail a one-of-a-kind addition
• Completely peaceful: safe with fish, shrimp, and plants
• Hardy and adaptable: tolerates a wide range of water parameters
• Small size allows access to tight crevices other algae eaters cannot reach
• Active and engaging: frequently seen scaling glass and decorations throughout the day

Care at a Glance

• Scientific Name: Clithon corona / Clithon diadema
• Common Names: Horned Nerite Snail, Thorny Nerite Snail, Thorn Nerite Snail, Spiked Nerite Snail, Sunny Snail, Bumblebee Snail
• Adult Size: 0.5" – 1" / 1.2 – 2.5 cm
• Lifespan: Approximately 1–2 years in captivity
• Temperature: 70°F – 80°F (21°C – 27°C)
• pH: 7.0 - 8.4 (alkaline water recommended; acidic water erodes shells)
• GH: 6 - 12 dH (harder water supports shell health)
• KH: 5 - 12
• TDS: 150 - 300
• Tank Size: 2 gallons minimum; 1 snail per 5–10 gallons recommended
• Diet: Herbivore — algae, biofilm, diatoms, decaying plant matter, algae wafers, blanched vegetables
• Temperament: Completely peaceful
• Difficulty: Beginner-friendly

Tank Setup

Ensure your aquarium is fully cycled and water parameters are stable before introducing any horned nerites — this species can be sensitive, especially soon after purchase when stressed from transport.

Horned nerites are not demanding about tank décor as long as there are plenty of surfaces to graze on. Rocks, driftwood, hardscape, and glass all make ideal grazing surfaces. Live plants are safe; horned nerites do not consume healthy plant tissue and will only graze on algae and dead or decaying matter on leaf surfaces.

Water hardness is important for long-term shell health. If your water is soft and you notice cracked or eroding shells, increase the minerals in your water and their food. Crushed coral in the substrate or filter media, along with mineral supplements providing calcium and magnesium, can buffer pH and support shell integrity.

Escape Warning: Horned nerites like to move up to the waterline and may crawl out of the aquarium if given the chance. Always use a tight-fitting lid and cover any snail-sized gaps.

Copper Warning: Horned Nerite Snails are highly sensitive to copper. Always check fertilizers, medications, and fish foods for copper content before use in a tank housing invertebrates.

CO₂ Warning: If injecting CO₂ for plant growth, avoid overdoing it — horned nerites do not respond well to high CO₂ levels.

Feeding

Horned Nerite Snails are algae-eating machines! You can actually see their teeth scraping away at glass surfaces, leaving a distinctive trail through the algae layer. In a tank with sufficient algae growth, supplemental feeding is rarely necessary.

In tanks that are kept very clean, supplement their diet with algae wafers, blanched zucchini, and canned green beans. Foods rich in calcium, like kale and spinach, also support healthy shell growth. Spirulina-based wafers and bee pollen are excellent optional additions. Remove any uneaten food within 24 hours to protect water quality.

Stock no more than one snail per 4–5 gallons to ensure adequate food supply, or supplement their diet with algae wafers. In larger groups, supplemental feeding becomes more important.

Will Horned Nerite Snails Breed in My Tank?

In the home freshwater aquarium, Horned Nerite Snails will lay small white eggs on tank decorations, glass, and plants, but these eggs will not hatch in freshwater. The larvae require brackish water with elevated salinity for proper development. This makes Horned Nerites one of the only algae-eating snails in the hobby that will never overpopulate a freshwater tank. The eggs themselves are harmless but can be difficult to remove once deposited. To minimize egg placement on visible surfaces, provide plenty of driftwood, rocks, and hides as preferred laying sites.

Compatible Tank Mates

Safe: Neocaridina shrimp (Red Cherry, Yellow, Blue Velvet, etc.), Caridina shrimp, Amano Shrimp, Otocinclus catfish, Corydoras, small Tetras, Rasboras, Livebearers, other peaceful nano fish, ramshorn snails, mystery snails

Avoid: Loaches (especially Clown and Yo-Yo Loaches), pufferfish, large cichlids, goldfish, crayfish, and any species known to eat or harass snails.

Frequently Asked Questions

Do horned nerite snails eat plants?

No. Horned Nerites are herbivores that feed exclusively on algae, biofilm, and decaying organic matter. They will not harm healthy plant tissue, making them completely safe for planted tanks and aquascapes.

Will horned nerite snails reproduce in my freshwater tank?

They will lay eggs that look like sesame seeds, but those eggs cannot hatch in freshwater. Successful hatching requires brackish water, so you will never experience a population explosion in a standard freshwater aquarium.

What algae do horned nerite snails eat?

Horned Nerites have a strong appetite for green spot algae and hair algae, as well as diatoms, brown algae, and general biofilm. They are one of the very few snails that will effectively tackle green spot algae on glass.

My horned nerite snail isn't moving. Is it dead?

It is not uncommon to see a horned nerite snail appearing inactive for a day or two — this is a natural behavior that often concerns new owners but is perfectly normal. If the snail has not moved in more than 48 hours, check for an unpleasant odor, which is the clearest indicator of death. If in doubt, gently remove and smell the opening of the shell.

Can horned nerite snails flip themselves over?

Yes. They are fully capable of righting themselves in most situations. If you notice one stuck upside down for an extended period, simply place it upright on a surface.

Can I keep just one horned nerite snail?

Yes. They are not social animals and do not require companions. A single snail will thrive in a well-maintained tank with adequate algae or supplemental feeding.