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Invertebrate Freshwater Care: easy Peaceful

Giant Ramshorn Snail

Marisa cornuarietis
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Other names: Colombian ramshorn, Columbian ramshorn, Marisa
Group: Snails · Family: Ampullariidae · Origin: Northern South America — Colombia, Venezuela and the Guianas

A large apple snail relative reaching up to 5 cm, with dark spiral bands on its flat coiled, light brown shell. Because it quickly eats plants, it is not suitable for a planted aquarium.

Will it suit my tank?

Last updated October 16, 2026

Temperature
21–28°C
pH
7–8
Hardness
8–18 dGH
Adult size
4.5 cm
Minimum tank size
60 liters
Social structure
Colony
Swimming zone
All levels
Diet
Omnivore
Breeding
Substrate spawner

Water parameters

Temperature21–28°C
pH7–8
General hardness (GH)8–18 dGH
Recommended range
Damages plants Considered shrimp safe

Overview

October 16, 2026 · Suggest an edit

The giant ramshorn snail resembles ramshorn snails in appearance but is actually a relative of the apple snails (Ampullariidae). Its shell coils like a flat disc, carries dark spiral bands on a light brown to yellowish background and reaches 4–5 cm in diameter. Because it does not belong to the genus Pomacea, it is not covered by the EU's Pomacea ban; however, it can become invasive when released into the wild in warm regions. Never release it into the wild.

Tank Setup

October 16, 2026 · Suggest an edit
  • 60 liters or more for a few individuals.
  • pH 7 or higher, moderately hard to hard water; calcium is needed for the shell.
  • Unplanted aquariums or tanks with only tough-leaved plants (Anubias, Java fern); soft plants are eaten in a short time.
  • Avoid products containing copper.

Diet

October 16, 2026 · Suggest an edit

Omnivorous with a very big appetite. It eats soft plants, algae, leftover food, sinking tablets and blanched vegetables. It is also known to eat the eggs of other snails. Giving plenty of vegetables can reduce plant damage but does not prevent it completely.

Behavior and Compatibility

October 16, 2026 · Suggest an edit

Peaceful toward fish and shrimp. The real problem is plants: it can consume live plants leaf by leaf.

Good companions: peaceful community fish and large shrimp in a setup that is unplanted or has only tough-leaved plants.

Avoid: planted aquariums, snail-eating fish (clown loach, pufferfish), crayfish.

A short profile for this species

The Giant Ramshorn Snail page has the basics, but the sections below have not been written yet. If you keep this species, write a section from your own experience; it will be published under your name after editor approval.

Tank mates

This list is calculated automatically from the species profile and grows as new species are added to the catalog. Try it in the planner for a definite answer.

Usually compatible

Hobbyist notes

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Change history and contributors
  1. Page created · October 16, 2026