Bladder Snail (Pest Snail)

Physella acuta

Invertebrates
Reviewed by Guidarium Editorial DeskUpdated April 28, 2026

A tiny, fast-moving freshwater snail almost universally introduced accidentally via live aquarium plants. While frequently labeled a 'pest' due to their rapid, prolific reproduction, they are actually an excellent cleanup crew. They consume algae, uneaten food, and decaying plant matter without harming healthy plants. They are hermaphroditic and can self-fertilize, meaning a single snail can start a massive colony.

Bladder Snail (Pest Snail) At a Glance

Adult Size1.5 cm
Body ShapeGlobular
Growth RateFast
TemperamentPeaceful
Water TypeFreshwater Only
Flow PreferenceLow
Waste OutputLow
StockingSolo or group

Bladder Snail (Pest Snail) Tank Requirements

Minimum Volume2 L
Minimum Length10 cm
FlowLow
Water TypeFreshwater Only
Must-Haves in the Tank
Established Algae (Otocinclus)
Stocking calculator

Will Bladder Snail (Pest Snail) fit in your tank?

Care guides tell you what Bladder Snail (Pest Snail) needs, the next question is whether your tank can safely provide it. Test Bladder Snail (Pest Snail) against your tank size, maintenance needs, and the fish you already keep before you buy.

Bladder Snail (Pest Snail)
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Bladder Snail (Pest Snail) Water Parameters

Temperature1030°C
pH68.5
Hardness420 dGH

Bladder Snail (Pest Snail) Temperament & Compatibility

Aggression LevelPeaceful
0/10
Where They Swim
Surface
Mid-level
Bottom
Stocking Guidelines
Keep at Least1 (solo is fine)
Max per TankNo limit
Can Live Alone?Yes
Behavior Traits
Nano / Bite-sized (Predation Risk)Hyperactive / Fast Swimmer

Bladder Snail (Pest Snail) Varieties

Each variety inherits the species defaults above. Only differences are highlighted.

Standard

The standard wild-type bladder snail. Characterized by a mottled, translucent shell that spirals to the left (sinistral) and thin, thread-like tentacles.

Differs in 1 trait from base species

Also known as: Common Bladder Snail

Behavior Traits
Nano / Bite-sized (Predation Risk)Hyperactive / Fast Swimmer

Bladder Snail (Pest Snail) Care Guide Summary

The Bladder Snail (Pest Snail), scientifically known as Physella acuta, belongs to the Invertebrates family group. Adults reach a maximum size of approximately 1.5 cm and have a globular body shape with a fast growth rate. Classified as peaceful, this species primarily occupies the surface, mid-level, and bottom zones of the aquarium and produces a low level of biological waste.

To thrive, the Bladder Snail (Pest Snail) requires a freshwater only aquarium with a minimum volume of 2 litres and a tank length of at least 10 cm. Water temperature should be maintained between 10°C and 30°C, with a pH range of 68.5 and a general hardness of 420 dGH. A low water flow is preferred.

The Bladder Snail (Pest Snail) is a rewarding species to keep, provided its core environmental needs are met. The Bladder Snail (Pest Snail) is typically available in one standard form.

Bladder Snail (Pest Snail) Habitat Setup

When setting up an aquarium for the Bladder Snail (Pest Snail), a low water flow best suits their natural preferences. Because this species occupies the surface, mid-level, and bottom zones, the aquarium layout should prioritise adequate surface area with floating cover to make them feel secure near the waterline, open swimming space in the centre of the tank for free movement, and sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include an established tank with natural algae growth, as they depend on it as a primary food source.

Bladder Snail (Pest Snail) Compatibility Notes

Classified as peaceful, the Bladder Snail (Pest Snail) is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. When choosing tankmates, their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the surface, mid-level, and bottom zones can help reduce competition and territorial overlap.

Who Bladder Snail (Pest Snail) Is Actually For

Bladder Snail (Pest Snail) is best for a fishkeeper who wants a species that can settle into a calmer community setup and can provide someone who understands its individual space requirements. It makes the most sense for a hobbyist who will actually build around its needs, especially established algae.

The most common mistake is buying Bladder Snail (Pest Snail) for looks first and only later discovering how its adult size, behavior, or bioload changes the whole tank plan. Another frequent problem is forcing it into an over-busy community when it would do better with more room or more deliberate tankmate choices.

Bladder Snail (Pest Snail) Recommended Tank Sizes

Standard aquarium sizes that meet the minimum volume and length requirements for Bladder Snail (Pest Snail).

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Frequently Asked Questions About Bladder Snail (Pest Snail)

How big does Bladder Snail (Pest Snail) get?

Bladder Snail (Pest Snail) (Physella acuta) typically reaches a maximum adult size of approximately 1.5 cm. They have a globular body shape and a fast growth rate.

What tank size does Bladder Snail (Pest Snail) need?

A minimum aquarium volume of 2 litres and a tank length of at least 10 cm are recommended for Bladder Snail (Pest Snail). This ensures enough swimming space and helps maintain stable water conditions.

What water parameters does Bladder Snail (Pest Snail) need?

Bladder Snail (Pest Snail) thrives in freshwater only conditions with a temperature range of 10–30°C, a pH between 6 and 8.5, and a general hardness of 4–20 dGH. A low water flow is preferred.

Is Bladder Snail (Pest Snail) peaceful or aggressive?

Bladder Snail (Pest Snail) is classified as peaceful with an aggression score of 0 out of 10. They are generally well-suited to peaceful community tanks.

Can Bladder Snail (Pest Snail) live alone?

Yes, Bladder Snail (Pest Snail) can be kept singly or in a group. They are flexible and adapt well to both setups.

Does Bladder Snail (Pest Snail) have any special tank requirements?

Yes. Bladder Snail (Pest Snail) benefits from established algae (otocinclus) in the aquarium. These features help replicate their natural habitat and promote overall health and well-being.

Editorial Review

Guidarium Editorial Desk

Reviewed against Guidarium care, stocking, and compatibility standards. Read the editorial policy.

Last reviewed
April 28, 2026
Last updated
April 28, 2026
Issues or corrections?
Contact the editorial team

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