Quick Stats
| Adult Size | 1–1.5 cm |
| Minimum Tank | Any |
| Temperature | 15–30°C |
| pH Range | 6.5–8.5 |
| Hardness (GH) | 5–25 dGH |
| Difficulty | Easy |
| Temperament | Peaceful |
| Diet | Detritivore/Herbivore — algae, detritus, dead plant matter, biofilm |
| Schooling | Colony — reproduces freely |
Tank Setup
Bladder snails (Physa acuta, sometimes sold as Physella) tolerate almost every water condition: temperature 15–30°C, pH 6.5–8.5, hardness 5–25 dGH. They will live in a 1 gallon jar or a 200 gallon display. They are the hardiest snail in the hobby by a wide margin.
They prefer harder water for shell health, but will survive and reproduce in soft water — shells just erode over time. A piece of cuttlebone or crushed coral in the filter keeps shells intact.
No special setup is needed. They live on every surface: glass, plants, hardscape, substrate. They can fill their 'bladder' with air and float to the surface, then release the air to sink — they are one of the few snails that actively controls buoyancy.
Tank Mates
Bladder snails are peaceful and edible. They coexist with every peaceful fish and invertebrate. The only risk is being eaten — they are a favoured food of Clown Loaches, Yoyo Loaches, Dwarf Puffers, and some cichlids.
Compatible with: all peaceful community fish, all shrimp, all other snail species. They are too small to bother anything and too fast-breeding to be wiped out by occasional predation.
If you want to keep them but have a snail-eating fish, the population will self-regulate — the fish eats what it can, the snails reproduce faster than predation. Equilibrium is reached within weeks.
Diet & Feeding
Bladder snails eat algae (including the green film on glass), detritus, dead plant matter, and biofilm. They do not eat healthy live plants — the 'plant eater' reputation comes from them gathering on already-dying leaves.
No direct feeding needed. They clean up whatever the fish miss. If you want to boost the population (some keepers want them as cleanup crew), drop a slice of cucumber or an algae wafer after lights-out.
They are useful in shrimp tanks — they eat the same biofilm and algae that shrimp eat, but they reach surfaces shrimp can't (like the inside of filter intake tubes). Many shrimp keepers deliberately keep a bladder snail colony as a 'canary' for water quality: if the snails are active and breeding, the water is fine for shrimp.
Common Health Issues
Bladder snails are essentially indestructible. The only thing that kills them (other than copper medication, which is lethal to all snails) is complete starvation — and even then, they can aestivate for weeks inside their shell.
Shell erosion in soft water is the main visible issue. The shells turn translucent and pitted. Fix with crushed coral, cuttlebone, or a pinch of crushed oyster shell in the filter.
Lifespan is short — typically 1 year. But the colony is immortal: a single bladder snail can produce 100+ offspring in its lifetime (they are hermaphroditic and self-fertile), so the population persists indefinitely once established.
Breeding
Bladder snails are hermaphroditic and self-fertile — a single snail can reproduce alone. They lay gelatinous egg masses (10–30 eggs each) on hard surfaces, which hatch in 7–14 days depending on temperature.
Breeding is not the challenge — controlling the population is. The colony expands to match available food. Overfeed and you'll have hundreds; starve them and the colony shrinks to a handful within weeks.
To remove excess: bait with cucumber or lettuce overnight, then remove the snail-covered vegetable in the morning. Repeat nightly. Assassin snails (Clea helena) will hunt them. Or simply reduce feeding — the population self-corrects within a month.
Frequently Asked Questions
Are Bladder Snails pests?
They reproduce freely, but they're genuinely useful — they eat algae, detritus, and dead plant matter without harming live plants. The 'pest' label comes from their uninvited arrival on plants, not from any damage they cause. In a balanced tank they're a useful cleanup crew.
How did Bladder Snails get in my tank?
They almost always arrive as eggs or juveniles on new plants, or in the bag water from a fish purchase. They are hermaphroditic and self-fertile, so a single snail can start a colony. This is why they're so widespread in the hobby.
Do Bladder Snails eat plants?
No — they eat algae, detritus, and already-dead plant matter. They gather on dying leaves because those leaves are decomposing, not because the snails killed them. They are safe in any planted tank.
How do I get rid of Bladder Snails?
Reduce feeding first — the population self-corrects within weeks. To actively remove them, bait with cucumber or lettuce overnight and remove the snail-covered vegetable in the morning. Assassin snails (Clea helena) will hunt them biologically. Avoid copper medications — they kill all snails and shrimp.