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Stomatella Snail
Stomatella varia
Animalia›Mollusca›Gastropoda›Trochidae
📍 Indo-Pacific reef rock
Fast-moving, flat-shelled snail that looks more like a slug. Reproduces readily in reef tanks, forming beneficial colonies that graze film algae and coralline. Fish generally ignore them; a great hitchhiker species.
Care Guide
Diet
Stomatella snails are herbivorous grazers that feed primarily on film algae, diatoms, and coralline algae. They require no supplemental feeding in established reef tanks with adequate algae growth, as they continuously graze on rock surfaces and substrate. In newer or heavily cleaned tanks, supplement with dried seaweed sheets or algae-based pellets to prevent starvation.
Behavior
These snails are highly active, fast-moving grazers that spend most of their time crawling across rocks and substrate in search of food. They are completely peaceful and nocturnal, becoming most active during evening hours and at night. They reproduce readily in stable reef environments, often forming beneficial colonies that help control nuisance algae without any intervention needed.
Breeding
Stomatella snails breed prolifically in captivity under stable conditions, with larvae developing in the water column and settling on surfaces. No special breeding setup is required; they simply reproduce naturally in established tanks with adequate food and stable parameters. Populations can grow rapidly, but they rarely become problematic as they self-regulate based on available food resources.
Tank Mates
Reef-safe fish that ignores snails; shares same saltwater habitat requirements
Algae-grazing fish that complements snail feeding behavior without predation
Compatible snail species with similar algae-grazing habits and peaceful nature
Reef-safe invertebrate that coexists peacefully in established systems
Peaceful reef invertebrate with no predatory interest in snails
Similar algae-grazing snail; may compete for food but generally compatible
Common Diseases
Shell Erosion
Pitting, roughness, or dissolution of shell surface; reduced shell integrity
Maintain stable pH (8.1-8.4) and alkalinity; ensure adequate calcium supplementation in reef tanks to support shell health
Parasitic Infection
Lethargy, reduced grazing activity, visible parasites on shell or foot
Quarantine affected snails; perform water changes; avoid copper-based treatments as snails are sensitive; maintain water quality
Starvation
Inactivity, withdrawal into shell, visible weight loss, death in newly established tanks
Ensure adequate algae growth or supplement with algae-based foods; avoid over-cleaning rocks; maintain stable, mature tank conditions
Osmotic Stress
Foot retraction, shell gaping, inability to adhere to surfaces
Maintain stable salinity (1.023-1.025 SG) and temperature; acclimate slowly if introducing to new systems; avoid sudden parameter changes
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Quick Facts
- pH
- 8.1–8.4
- diet
- herbivore — film algae, diatoms
- maxSize
- 1 inch
- minTankSize
- 5 gallons
- temperature
- 72–82°F (22–28°C)
Temperature
72–82°F
22–28°C