Clithon sp. (Black Fancy Horned Snail)

25 March 2026

1016

The Black Fancy Horned Snail (Clithon sp.) is a highly sought-after, peaceful algae eater for freshwater aquariums. Known for its striking, dark shell and voracious appetite for diatoms and green spot algae, this compact nerite variant is an invaluable cleanup crew member that won't reproduce in freshwater.

Overview

The Black Fancy Horned Snail, scientifically known as Clithon sp. (often referred to in the hobby as the Black Fancy Geweihschnecke), is a popular and industrious freshwater aquarium snail. Renowned for their exceptional algae-clearing abilities, these snails are a favorite among aquascapers and casual hobbyists alike. They are entirely peaceful and will not harm live aquatic plants, making them a perfect addition to planted setups.

Image of black fancy geweihschnecke clithon sp

Distribution and Habitat

In the wild, Clithon species are native to the coastal regions and river mouths of Asia, including countries like Indonesia, Japan, and the Philippines. They inhabit estuaries and lower river basins where freshwater mixes with ocean tides, creating a brackish environment. They are typically found clinging to rocks, submerged driftwood, and mangrove roots, grazing on the abundant biofilm and algae.

Description of Black Fancy Horned Snail

Despite being called a "Horned" snail (Geweihschnecke), the Black Fancy variant often features very subtle, reduced, or sometimes entirely absent horns, presenting a smooth, rounded shell. As seen in the provided images, their shells boast rich, earthy tones ranging from deep mahogany and dark brown to almost solid black, occasionally with subtle banding or lighter olive patches. They are quite small, generally reaching a maximum size of only 1.5 to 2 centimeters in diameter, which allows them to clean tight crevices in the aquarium.

Keeping and Caring for Black Fancy Horned Snail

Caring for these snails is relatively straightforward, provided they are placed in a mature aquarium with plenty of natural algae growth. They are peaceful and can be kept with most community fish, shrimp, and other non-aggressive invertebrates. Because of their small size, care should be taken to avoid keeping them with large, shell-crushing fish like certain loaches or cichlids.

Tank size:

A minimum tank size of 5 gallons (approximately 20 liters) is suitable for a small group of these snails. Their small bioload makes them excellent candidates for nano aquariums.

Water Parameters:

Stability is key for the Black Fancy Horned Snail. Like most snails, they require specific water conditions to maintain healthy shells and overall vitality.

Temperature

They thrive in tropical temperatures ranging from 22 to 28 °C (72 to 82 °F).

pH

A slightly alkaline pH between 7.0 and 8.2 is highly recommended. Acidic water can cause their shells to erode and pit over time.

Hardness

Moderate to hard water is essential. Aim for a General Hardness (GH) of 8 to 20 dGH to provide the calcium necessary for robust shell growth.

Ammonia, Nitrite, Nitrate

Ammonia and Nitrite must always be at 0 ppm. Nitrates should be kept as low as possible, ideally below 20 ppm. They are also highly sensitive to copper and other heavy metals.

Feeding the Black Fancy Horned Snail

These snails are obligate algae eaters and will spend the majority of their time grazing on glass, rocks, and plant leaves. They are particularly effective against diatoms (brown algae) and green spot algae. If the aquarium is kept too pristine, their diet must be supplemented to prevent starvation. Offer high-quality algae wafers, spirulina powder, or blanched vegetables such as zucchini, spinach, and cucumber.

Breeding Black Fancy Horned Snail

One of the greatest benefits of keeping Clithon sp. is that they will not overpopulate a freshwater aquarium. While females will lay small, white, sesame-seed-like egg capsules on hard surfaces (including rocks, wood, and sometimes even other snails' shells), the larvae require brackish or marine water to develop and survive. In a standard freshwater tank, the eggs will simply fail to hatch.

Conclusion

The Black Fancy Horned Snail is a beautiful, efficient, and low-maintenance addition to the freshwater aquarium. Their striking dark coloration, manageable size, and inability to breed in freshwater make them one of the best cleanup crew options available. By providing them with hard water and plenty of algae to graze on, aquarists can enjoy their tireless cleaning efforts for years to come.

Snail info

Temperature : 22 - 28 °C
pH: 7.0 - 8.2
Color Form: Black

Related on Snails

Leave your comments

Latest on Snails

Yellow Baby Poso Snail, Tylomelania sp.

The Yellow Baby Poso Snail is a juvenile Tylomelania identified in the trade as Tylomelania sp. Its yellow to golden body contrasts with a dark, strongly ribbed shell. The “Poso” name suggests a Sulawesi lake lineage, but the exact species and locality cannot be confirmed from the supplied trade name or photographs alone. This is a freshwater snail for warm, mineral-rich aquariums and should be kept with peaceful tank mates that will not damage its soft body or feelers.
Gelbe Rennschnecke (Vittina waigiensis)

Vittina waigiensis is a nerite snail kept for grazing algae and biofilm on aquarium glass, rocks and hardscape. Its rounded shell may show yellow, orange or reddish tones with dark markings, but commercial names are not always applied consistently. Identification from photographs alone can be uncertain, so shell pattern should be checked against a reliable taxonomic reference. Adults are generally peaceful and do not normally damage healthy aquarium plants.
Devil's Thorn Snail (Faunus ater)

Faunus ater is a large, elongated pachychilid snail from tropical Indo-West Pacific waters. It is associated with freshwater streams, rivers and estuarine habitats, and aquarium specimens are often kept in freshwater or mildly brackish conditions. Its dark, banded or reddish-brown shell is distinctive, although identification from photographs alone can be uncertain. It is generally peaceful, plant-safe and slow to reproduce in typical freshwater aquaria.
Deadpool Rennschnecke (Vittina waigiensis)

Vittina waigiensis is a nerite snail sold in the aquarium trade under names such as Deadpool Rennschnecke, usually referring to a striking red shell with dark patterning. It is a peaceful algae grazer that generally leaves healthy plants alone. Adults can live in freshwater aquariums, but successful reproduction requires brackish or marine conditions during the larval stage. The trade name and shell pattern are not sufficient for absolute identification, so the species assignment should be treated as provisional unless confirmed by specialist examination.
Cappuccino Snail (Faunus ater)

Faunus ater is a large pachychilid snail associated with tropical rivers, streams and estuarine environments across parts of the Indo-Pacific. Its dark, elongated shell commonly has reddish-brown, orange or pale bands toward the tip. In aquaria it is generally a peaceful grazer that feeds on algae, biofilm and sinking foods. Successful reproduction is unusual in ordinary freshwater tanks because its life cycle includes free-floating larvae requiring suitable water conditions.
Bubble snail (Physa sp.)

Bubble snails sold or observed under Physa sp. are small freshwater bladder snails commonly introduced with aquatic plants. They graze on algae, biofilm and soft organic residues, and usually leave healthy plants alone. Their rapid reproduction can make them conspicuous in well-fed aquariums. Exact species identification is uncertain from the supplied name and images, so care guidance is presented for Physa-type freshwater snails rather than a single confirmed species.
Brown Ramshorn Snail (Planorbella duryi duryi)

The brown ramshorn snail is a freshwater planorbid recognized by its flat, coiled shell and air-breathing habit. Planorbella duryi duryi is generally peaceful and useful as a scavenger, although it can reproduce rapidly when food is abundant. The supplied photographs show a brown ramshorn-like snail, but shell appearance alone cannot confirm the subspecies; this article follows the supplied identification while noting that limitation.
Blue Jelly Snail (Taia sp.)

The Blue Jelly snail, often associated with the genus Taia, is a striking freshwater gastropod known for its vibrant blue foot and patterned shell. While precise taxonomic classification remains subject to ongoing debate within the hobby, these snails are popular for their unique appearance and relatively peaceful temperament in community aquariums, making them a fascinating addition for dedicated invertebrate keepers.
Black Lace Snail (Melanoides maculata)

The Black Lace Snail, scientifically identified as Melanoides maculata, is a distinctive freshwater gastropod often appreciated for its elongated, turret-like shell. While taxonomy within the Thiaridae family can be complex and subject to revision, this species is noted for its dark, textured appearance. It is a hardy inhabitant suitable for various tropical aquarium setups, provided the substrate remains clean and oxygenated.
Black Fancy Clithon Snail

The Black Fancy Clithon snail is a popular choice for freshwater aquariums due to its effective algae-eating habits. Often referred to as a variation of the horned nerite snail family, these small gastropods are highly valued for their peaceful temperament and ability to keep hard surfaces clean. They are generally hardy, provided their specific water quality and dietary requirements are met.
Big Stripe Mosaic Racing Snail (Neritina sp.)

The Big Stripe Mosaic Racing Snail is a visually striking gastropod often sought for its appetite for algae. Belonging to the Neritidae family, these snails are popular in the hobby for their unique shell patterns and efficient cleaning habits. While they are excellent additions to freshwater aquariums, they require specific environmental conditions to thrive and remain healthy in captivity.
Bee Snail (Brotia dautzenbergiana)

The Bee snail, scientifically known as Brotia dautzenbergiana, is a freshwater gastropod recognized for its elongated, spiraled shell featuring distinct dark bands. Native to Southeast Asian river systems, this species is popular among aquarium hobbyists for its unique appearance and relatively peaceful nature. Providing a stable environment is essential for their long-term health and success in a home aquarium setting.
Batman Snail (Neritina taitensis)

The Batman snail, scientifically known as Neritina taitensis, is a unique freshwater gastropod often kept by aquarists for its distinct shell morphology and algae-eating habits. Originating from tropical regions, this species is appreciated for its ability to clean hard surfaces in the aquarium. Proper care requires stable water conditions and a diet supplemented with biofilm and algae.
Batik Snail (Neritina variegata)

The Batik snail, scientifically classified as Neritina variegata, is a popular freshwater gastropod appreciated for its striking shell patterns and efficient algae-eating habits. Native to various tropical regions, these snails are highly sought after by aquarists for their ability to keep glass and decor clean without becoming a nuisance in the home aquarium environment.
Biofilm Grazing Snail Combinations

Biofilm grazing snails are popular additions to freshwater aquariums for their ability to naturally manage bacterial mats and algae. This set typically features a mix of species, such as Neritidae and Planorbidae, which function as effective cleanup crews. These invertebrates thrive in established tanks, providing essential maintenance while adding biodiversity to the underwater landscape through their varied shell patterns and colors.
Blue Post Horn Snail (Planorbella duryi)

The blue post horn snail is a popular freshwater gastropod known for its striking shell coloration and active nature in home aquariums. As a color variant of the common ramshorn snail, it is highly valued by hobbyists for its algae-consuming habits and ease of care, making it a suitable addition to many community tank setups.