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SnailbeginnerFreshwater

Bladder Snail

Physella acuta

AnimaliaMolluscaGastropodaPhysidae

📍 Worldwide (invasive)

Ask Finn

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.

Size0.5"
Min Tank5g
peaceful
Zoneall

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.

Common Diseases

Shell Erosion

Symptoms

Pitted, chalky, or dissolving shell surface; reduced shell integrity and visible damage to shell structure

Treatment

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

Symptoms

Lethargy, reduced feeding activity, visible parasites on shell or body, abnormal mucus production

Treatment

Perform 25% water changes and improve tank hygiene; quarantine affected snails; use copper-free treatments as copper is toxic to snails

Bacterial Infection

Symptoms

Foul odor from tank, discolored or decaying tissue, snail refusing to emerge from shell, cloudy water

Treatment

Perform immediate 50% water change, improve filtration and aeration, remove decaying organic matter, maintain optimal water parameters

Nutritional Deficiency

Symptoms

Slow growth, thin or brittle shells, reduced activity and feeding, pale coloration

Treatment

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)

Stats

Community tips0
Kept by0 hobbyists