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Cerith Snail
Cerithium sp.
Animalia›Mollusca›Gastropoda›Cerithiidae
📍 Indo-Pacific & Caribbean Reefs
Small, elongated shell snail that works the sand bed, glass, and rocks. Excellent algae grazer and detritivore. Reproduces readily and stays small.
Care Guide
Diet
Cerith snails are primarily detritivores and algae grazers that feed continuously on biofilm, decaying matter, and algae on sand, glass, and rockwork. They require no supplemental feeding in established tanks with adequate algae growth, but can be offered blanched vegetables or sinking pellets if algae becomes scarce. Feed sparingly—overfeeding degrades water quality and encourages excess detritus accumulation.
Behavior
Cerith snails are nocturnal and spend most of their time burrowing through sand and grazing on surfaces, making them excellent for substrate maintenance. They are peaceful, solitary snails that rarely interact with other inhabitants and can reproduce prolifically in stable conditions. They are most active during low-light hours and may retreat into their shells during bright periods.
Breeding
Cerith snails breed readily in captivity without special conditions, and populations can grow rapidly in established tanks. Females lay small egg capsules on surfaces, which hatch into planktonic larvae before settling. Population control may be necessary in mature systems, as they can become abundant and compete for food resources.
Tank Mates
Similar algae-grazing behavior and peaceful temperament; compatible water parameters
Both are reef-safe detritivores with identical saltwater requirements
Comparable grazing habits; may compete for algae but generally coexist peacefully
Small, reef-safe fish that ignore snails and thrive in identical conditions
Peaceful invertebrate that shares the same sand-dwelling niche without predation risk
Non-predatory cleaner shrimp compatible with snails in reef environments
Common Diseases
Shell Erosion
Pitting, thinning, or deterioration of shell surface; exposed soft tissue
Increase calcium supplementation and maintain stable pH 8.1–8.4; improve water quality and reduce acidic conditions
Parasitic Infection
Lethargy, reduced feeding, visible parasites on shell or body, mucus coating
Quarantine affected snails; perform water changes; use copper-free treatments if necessary; improve tank hygiene
Starvation
Withdrawn behavior, failure to emerge from shell, visible weight loss
Ensure adequate algae growth through proper lighting; supplement with algae wafers or blanched vegetables if needed
Sudden Death Syndrome
Rapid decline, gaping shell, death within hours to days
Check water parameters immediately (pH, salinity, temperature); perform partial water change; avoid sudden environmental changes
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Quick Facts
- pH
- 8.1–8.4
- diet
- algae/detritus
- salinity
- 1.023–1.025 SG
- minTankSize
- 10 gallons
- temperature
- 75–81°F (24–27°C)
Temperature
75–81°F
24–27°C