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Assassin Snail (Anentome helena)

Assassin snails are the biological fix for a pest snail outbreak: they actively hunt and eat ramshorns, bladder snails, and trumpet snails, and a small group will collapse an infestation within a couple of months. They are genuinely predatory, so do not add them to a tank where you want other snails to live. Once the pests run out, supplement with bloodworms or other protein so they do not starve.

Care specifications

TypeSnail
DifficultyEasy
Max size1 in
Lifespan2–3 years
Temperature70–82 °F
pH7–8
General hardness8–15 dGH
Calcium needsMedium
Minimum tank size10 gallons
DietLive snails, Bloodworms, Brine shrimp, Carrion, Protein-rich sinking foods
RolesPest control, Scavenger
Plant safeYes
Betta compatibleYes
Breeds in freshwaterYes
Population growthSlow
TemperamentPredatory

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Assassin Snail

3 Assassin Snails (Clea helena)

$10.99 In stock

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Frequently asked questions

Will assassin snails eat my shrimp?

Healthy adult shrimp are far too fast — an assassin has no realistic chance of catching one. They will eat shrimp that are already dead or dying, and there are occasional reports of them taking newly molted or very small shrimplets, so in a high-value breeding colony use them with that caveat.

Will assassin snails overrun my tank like the pests they eat?

No. They lay single eggs rather than clutches, the eggs take over a month to hatch, and juveniles spend months buried in the substrate. A population grows slowly enough that most keepers wish they had more, not fewer.

What do I feed assassin snails after the pest snails are gone?

Frozen bloodworms, brine shrimp, and protein-rich sinking pellets all work — drop food near where they bury themselves at dusk. They are carnivores and will slowly starve in a clean tank with no snails and no meaty food, so plan for feeding once the buffet runs out.

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