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Margarita Snail
Margarites pupillus
Animalia›Mollusca›Gastropoda›Trochidae
📍 Eastern Pacific — Alaska to Baja California
Small, cold-water snail — an exceptional algae grazer often used in reef tanks as clean-up crew. Prefers cooler temperatures so it's ideal for FOWLR tanks or tanks below 74°F. Peaceful and prolific.
Care Guide
Diet
Margarita snails are herbivorous grazers that primarily consume film algae, diatoms, and coralline algae found on rocks and tank surfaces. They do not require supplemental feeding in established tanks with adequate algae growth, but in newer or heavily cleaned tanks, offer dried seaweed sheets or algae wafers 2-3 times weekly. They will not consume macroalgae or damage healthy corals.
Behavior
These small, peaceful snails are active grazers that spend most of their time slowly moving across surfaces in search of food. They are solitary and non-aggressive toward all tank inhabitants, making them ideal cleanup crew members. They are most active during cooler hours and may retreat into their shells during warmer periods, which is normal behavior.
Breeding
Breeding Margarita snails in captivity is extremely rare and poorly documented. They are broadcast spawners that require specific environmental cues and larval development stages difficult to replicate in home aquariums. Captive-bred specimens are virtually unavailable; wild-caught individuals are the standard in the hobby.
Tank Mates
Compatible saltwater species with similar peaceful temperament and no predatory behavior toward snails
Peaceful invertebrate that shares the same ecological niche and water parameters
Another peaceful algae-grazing snail with identical care requirements; may compete for food but will coexist
Peaceful herbivorous fish that grazes algae; compatible in cool-water reef setups
Small, peaceful fish suitable for cool saltwater tanks; will not predate on snails
Common Diseases
Shell Erosion
Pitting, chalky appearance, or thinning of shell; reduced activity
Ensure adequate calcium supplementation and stable pH (8.1-8.4); perform regular water changes to maintain water quality and mineral content
Parasitic Infection
Excessive mucus production, inability to retract into shell, lethargy, or visible parasites on body
Quarantine affected snail; perform freshwater dips (brief, 1-2 minutes) or use copper-free treatments; improve water quality and reduce stressors
Starvation
Visible weight loss, reduced activity, failure to graze, or empty shell appearance
Increase algae growth by reducing tank cleaning frequency or adding algae wafers; ensure adequate lighting to promote diatom and film algae growth
Temperature Stress
Lethargy, reduced grazing activity, or prolonged shell retraction in tanks warmer than 18°C
Maintain water temperature between 10-18°C using a chiller if necessary; avoid rapid temperature fluctuations; ensure adequate water circulation
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Quick Facts
- pH
- 8.1–8.4
- diet
- herbivore — film algae, diatoms, coralline
- maxSize
- 0.75 inches
- minTankSize
- 10 gallons
- temperature
- 50–64°F (10–18°C)
Temperature
50–64°F
10–18°C