Species · Anentome helena (Clea helena)

Assassin snail: tank size, water and tank mates

Predator of other snails (incl. nerites/mysteries); safe with shrimp and fish per ACO.

Adult size3 cm (1.2 in)
Minimum tank10 US gal
Temperature24–27 °C (75–81 °F)
pH7–8
Temperamentpeaceful
Keep in groups ofAlone or pairs
Swimsbottom
Shrimp & snailsCaution

Check a tank with Assassin snail

Good tank mates for Assassin snail

These species share its temperature range and temperament, with no fin-nipping or predation risk under our rules. Still check your tank size and bioload in the checker.

Black neon tetra · Black phantom tetra · Bleeding heart tetra · Bristlenose pleco · Bronze corydoras · Celestial pearl danio · Chili rasbora · Clown killifish · Clown pleco · Dwarf pencilfish · Ember tetra · Emperor tetra · Endler's livebearer · Forktail blue-eye · Glass catfish · Glowlight tetra · Golden pencilfish · Habrosus corydoras · Harlequin rasbora · Head-and-tail-light tetra · Julii corydoras · Lambchop rasbora · Lemon tetra · Marbled hatchetfish

Avoid with Assassin snail

Agassiz's dwarf cichlid (predation) · Angelfish (predation) · Bala shark (predation) · Banded archerfish (predation) · Black ghost knifefish (predation) · Buenos Aires tetra (predation) · Clown loach (predation) · Cockatoo dwarf cichlid (predation) · Common / comet goldfish (temperature) · Convict cichlid (predation) · Demasoni cichlid (predation) · Discus (temperature) · Dojo loach (temperature) · Electric yellow lab (predation) · Fancy goldfish (temperature) · Firemouth cichlid (predation) · Gold barb (temperature) · Jack Dempsey (predation)

Sources

Checked 2026-11-09 · confidence: high. These are cautious community guidelines, not guarantees. Not veterinary advice. Report an error.