Clithon corona (Sun Horned Snail)

12 April 2026

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The Sun Horned Snail (Clithon corona), known as 'Geweihschnecke' in German, is a stunning and highly efficient algae eater. Featuring striking yellow and black patterns adorned with distinctive spikes, this peaceful snail is perfect for freshwater nano tanks. It diligently cleans glass and hardscape without reproducing in freshwater.

Overview

The Sun Horned Snail, scientifically known as Clithon corona and commonly referred to as "Geweihschnecke" in the hobby, is a beloved addition to many freshwater aquariums. Renowned for its voracious appetite for algae and striking appearance, this small nerite snail is both functional and highly decorative.

Image of geweihschnecke sun clithon corona

Distribution and Habitat

Native to the Indo-Pacific region, Clithon corona is typically found in the lower reaches of rivers, estuaries, and coastal streams across Asia. They inhabit areas where freshwater meets the ocean, thriving in environments with a mix of fresh and brackish water. In the wild, they are often found clinging to rocks, driftwood, and mangrove roots where algae growth is abundant.

Description of Sun Horned Snail

The Sun Horned Snail is characterized by its relatively small size, usually reaching only 1.5 to 2 centimeters in diameter. Its most defining feature is the presence of several horn-like spikes protruding from its shell, which serve as a defense mechanism against predators. The "Sun" variant boasts a beautiful coloration, typically featuring alternating bands of bright yellow, orange, and black, though individual patterns can vary significantly from spots to thick zig-zag stripes.

Keeping and Caring for Sun Horned Snail

Caring for the Sun Horned Snail is relatively straightforward, making it an excellent choice for both beginners and experienced aquarists. They are peaceful, completely plant-safe, and will not bother tank mates. However, they are sensitive to poor water quality and sudden fluctuations.

Tank size:

Due to their small size, a minimum tank size of 5 gallons (approx. 20 liters) is sufficient for a small group of these snails. However, because they rely heavily on naturally occurring algae, larger or well-established tanks are preferred to ensure a constant food supply.

Water Parameters:

Temperature

They thrive in tropical temperatures ranging from 22 to 28 °C (72 - 82 °F). Keeping the temperature stable is crucial for their metabolism and overall health.

pH

A slightly alkaline pH is essential for shell health. Maintain the pH between 7.0 and 8.5 to prevent their shells from slowly dissolving or pitting over time.

Hardness

Hard water is a must. They require a General Hardness (GH) of 8-20 dGH and a Carbonate Hardness (KH) of 3-15 dKH. The calcium and minerals in hard water are necessary for them to maintain their thick, horned shells.

Ammonia, Nitrite, Nitrate

Like most invertebrates, they are highly sensitive to nitrogenous waste. Ammonia and Nitrite must always be at 0 ppm. Nitrates should be kept as low as possible, ideally below 20 ppm. Copper medications are strictly toxic and will be fatal.

Feeding the Sun Horned Snail

The diet of Clithon corona consists almost entirely of algae and biofilm. They are phenomenal cleaners, meticulously scraping green spot algae, diatoms, and soft green algae from aquarium glass, rocks, and decorations. If the tank is too clean, their diet must be supplemented with high-quality algae wafers, spirulina powder, or blanched vegetables like zucchini and spinach to prevent starvation.

Breeding Sun Horned Snail

One of the biggest advantages of keeping Sun Horned Snails is that they will not overrun your aquarium. While females will lay small, white, sesame-seed-like egg capsules on hard surfaces (like wood or even other snail shells), these eggs require brackish or marine water to hatch and develop. In a standard freshwater aquarium, the eggs will simply not hatch, making population control effortless.

Conclusion

The Sun Horned Snail is an exceptionally attractive and utilitarian addition to the freshwater aquarium. With its striking yellow and black horned shell, peaceful demeanor, and unmatched algae-eating capabilities, it brings both beauty and balance to the aquatic environment. Provided with hard water and plenty of biofilm, Clithon corona will be a long-lived and fascinating inhabitant in your tank.

Snail info

Temperature : 22 - 28 °C (72 - 82 °F)
pH: 7.0 - 8.5
Color Form: Black, Orange, Yellow

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