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Giant Ramshorn Snail
Marisa cornuarietis
Family: Ampullariidae
📍 South America
The Giant Ramshorn (Colombian Ramshorn) is a large, impressive snail with a distinctive flat, coiled shell striped in brown and cream — reaching up to 5 cm — distinguishing it from the smaller true ramshorn (Planorbarius). Unlike many ornamental snails it has a voracious appetite for aquatic plants and should not be kept in planted aquariums; it is best suited to fish-only or utilitarian setups where its algae and detritus grazing is beneficial. It reproduces readily in freshwater.
Keeping this species
- diet
- Omnivore – aquatic plants (caution!), algae, detritus, sinking pellets
- breeding
- Prolific in freshwater; egg masses on hard surfaces
- lifespan
- 3–5 years
- max size
- 5 cm (2 in)
- tank size
- 15 gallons minimum
- temperament
- Peaceful toward fish; destructive toward plants
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Water it likes
- ph
- 7.0–8.0
- ammonia
- 0 ppm
- nitrate
- <20 ppm
- hardness
- 8–18 dGH
- temperature
- 68–82°F (20–28°C)
Natural Habitat Temperature
72°F — 79°F seasonal range · (Jan low, Apr high)