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Bladder Snail
Physella acuta
Animalia›Mollusca›Gastropoda›Physidae
📍 Worldwide (invasive)
Bladder Snails are small, sinistral (left-coiled) freshwater snails with translucent amber shells, often introduced accidentally with plant purchases. They are voracious detritivores and algae grazers that help clean up uneaten food and decaying plant matter, contributing to tank cleanliness. Population explosions occur with overfeeding; controlled feeding keeps numbers in check. They serve as an excellent food source for pea puffers and assassin snails.
Care Guide
Diet
Bladder Snails are omnivorous detritivores that primarily consume algae, biofilm, and decaying plant matter. They will readily consume uneaten fish food and organic debris, making them excellent cleanup crew members. Feed sparingly with high-quality sinking pellets or algae wafers only if algae growth is insufficient; overfeeding directly causes population explosions.
Behavior
Bladder Snails are highly active, mobile grazers that spend most of their time crawling along surfaces searching for food and algae. They are peaceful and non-aggressive toward all tank inhabitants, though they may occasionally damage delicate aquatic plants while foraging. These snails are prolific breeders and can quickly overpopulate tanks if food availability is not carefully managed.
Breeding
Bladder Snails are self-fertilizing hermaphrodites that breed prolifically in captivity with minimal intervention required. They will lay clusters of transparent eggs on hard surfaces, with hatchlings appearing within 2-3 weeks under standard aquarium conditions. Population control is achieved through limiting food availability and manual removal of egg clusters; breeding is essentially impossible to prevent in established tanks.
Tank Mates
Assassin Snails actively hunt and consume Bladder Snails; useful for population control but will eliminate them entirely if not monitored
Pea Puffers feed on small snails including Bladder Snails; can help control populations but may be too aggressive for peaceful community tanks
Both are peaceful algae grazers with identical water parameter requirements; excellent cleanup crew combination
Compatible snail species with similar peaceful temperament and detritivore diet; can coexist without competition
Peaceful fish with overlapping temperature ranges; will not predate on adult snails but may consume eggs
Small peaceful fish with compatible water parameters; snails and tetras occupy different ecological niches in the tank
Common Diseases
Shell Erosion
Pitted, chalky, or dissolving shell surface; reduced shell integrity and visible damage to shell structure
Increase water hardness (5-20 dGH) with calcium supplements or crushed coral; ensure adequate pH (7.0-8.0) to support shell mineralization
Parasitic Infection
Lethargy, reduced feeding activity, visible parasites on shell or body, abnormal mucus production
Perform 25% water changes and improve tank hygiene; quarantine affected snails; use copper-free treatments as copper is toxic to snails
Bacterial Infection
Foul odor from tank, discolored or decaying tissue, snail refusing to emerge from shell, cloudy water
Perform immediate 50% water change, improve filtration and aeration, remove decaying organic matter, maintain optimal water parameters
Nutritional Deficiency
Slow growth, thin or brittle shells, reduced activity and feeding, pale coloration
Provide varied diet including algae wafers, blanched vegetables, and calcium-rich foods; ensure adequate mineral content in water through hardness maintenance
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Quick Facts
- diet
- Omnivore – algae, detritus, uneaten fish food, decaying plant matter
- breeding
- Prolific; self-fertilising hermaphrodite; populations controlled by limiting food
- lifespan
- 1–2 years
- max size
- 1.5 cm (0.6 in)
- tank size
- 5 gallons minimum
- temperament
- Peaceful
Water it likes
- ph
- 7.0–8.0
- ammonia
- 0 ppm
- nitrate
- <30 ppm
- hardness
- 5–20 dGH
- temperature
- 64–86°F (18–30°C)