Quick Stats
| Adult Size | 3–6 cm |
| Minimum Tank | 5 gal |
| Temperature | 10–28°C |
| pH Range | 6.5–8.5 |
| Hardness (GH) | 5–25 dGH |
| Difficulty | Easy |
| Temperament | Peaceful |
| Diet | Herbivore/Detritivore — algae, plant matter (including some live plants), detritus |
| Schooling | Colony — reproduces freely |
Tank Setup
Pond snails (Lymnaea stagnalis and related species) are cold-water natives that tolerate an enormous range: 10–28°C, pH 6.5–8.5, hardness 5–25 dGH. They are one of the few snails that genuinely thrives in an unheated tank or outdoor tub.
A 5 gallon tank is enough for a small colony. They don't need hardscape — they live on plants and the glass. Harder water keeps shells thick; in soft water, supplement with cuttlebone.
They breathe air using a lung (not gills), so they surface regularly. They can also absorb dissolved oxygen through their skin in well-oxygenated water. This makes them tolerant of low-oxygen conditions that would kill other snails.
Tank Mates
Pond snails are peaceful and ignored by most fish. Their larger size (up to 6 cm) makes them harder for fish to eat than bladder snails, but Clown Loaches and pufferfish will still take them.
Compatible with: goldfish (cold-water overlap), White Cloud Mountain Minnows, Cherry Shrimp, Amano Shrimp, and most tropical community fish at 22–24°C. Avoid housing with dedicated snail-eaters.
They are a natural food for many pond fish — if you keep goldfish or koi outdoors, pond snails are part of the ecosystem. In an indoor display tank they're more of a curiosity than a cleanup crew.
Diet & Feeding
Pond snails are primarily herbivorous. They eat algae, dead plant matter, and — unlike most aquarium snails — they will nibble on soft live plants. Duckweed, Cabomba, and young Amazon Sword leaves are all targets.
They are not as reliable a cleanup crew as Malaysian Trumpet Snails (substrate) or Nerite snails (algae on glass). Their value is more as a cold-water curiosity or as live food for snail-eating fish.
Feed algae wafers, blanched lettuce, or cucumber if the tank doesn't have enough natural food. They eat constantly and grow fast — a 1 cm juvenile can reach 4 cm in three months with abundant food.
Common Health Issues
Pond snails are incredibly hardy. The only real threat is copper (lethal to all snails) and starvation. They can survive freezing water in winter and 30°C+ in summer — they are true temperate-zone survivors.
Shell health depends on calcium. In hard water they grow thick, banded shells. In soft water the shells erode and the snails eventually die. Add cuttlebone or crushed coral if your tap water is soft.
Lifespan is typically 1–2 years. They lay visible gelatinous egg masses (20–80 eggs each) on plants and glass, which hatch in 10–20 days depending on temperature.
Breeding
Pond snails are hermaphroditic but require a partner to reproduce (unlike bladder snails, which can self-fertilise). Two snails will mate and both lay eggs. Eggs are laid in gelatinous masses on plants, glass, and hardscape.
Breeding is unavoidable if you have two or more — they reproduce year-round in warm water, seasonally in cold. Population control is the same as for bladder snails: reduce feeding, bait with cucumber, or introduce assassin snails.
Eggs hatch in 10–20 days depending on temperature. Juveniles reach adult size in 3–6 months. A single pair can produce hundreds of offspring over a year.
Frequently Asked Questions
Are Pond Snails the same as Bladder Snails?
No — they are different species. Pond snails (Lymnaea stagnalis) grow much larger (up to 6 cm) and have a pointed spiral shell. Bladder snails (Physa acuta) stay under 1.5 cm and have a sinistral (left-coiling) shell. Pond snails are also more likely to nibble live plants.
Do Pond Snails eat live plants?
Yes, occasionally — they are more herbivorous than bladder snails and will nibble soft plants like Cabomba, duckweed, and young Amazon Sword leaves. Hardy plants (Java fern, Anubias) are safe. If you have a prized planted display, choose Nerite snails instead.
Can Pond Snails live in a cold-water tank?
Yes — they are cold-water natives that tolerate 10–28°C. An unheated tank or outdoor tub is ideal. They are one of the few snails that genuinely thrive alongside goldfish in a cold-water setup.
How big do Pond Snails get?
Up to 6 cm in shell length, making them one of the largest commonly-available aquarium snails. They grow quickly — a 1 cm juvenile can reach 4 cm in three months with abundant food.