Max Size: 2 cm

Assassin Snail (Clea Helena)

The Assassin snail is relatively hardy, but it naturally requires good water quality. They are not challenging to take care of as long as the water conditions are right, and they have plenty of food.

They are least active during mid-day, and aquatic plants are perfectly safe from these opportunistic carnivores, and they are handy to have to keep other snail populations down.

Assassin Snails are also very attractive, the ribbed conical yellow-cream shell is complemented with dark brown spirals, and dark speckles throughout and the body is a greyish green in colour.

Quick Facts
Scientific NameClea Helena
Other NamesBumblebee Snail
OriginsSoutheast Asia
Aquarium LevelBottom
DifficultyBeginner - Intermediate
Best kept asGroups 6+
Lifespan2 - 5 years
Water Parameters
Water TypeFreshwater
Temperature72 - 81 ℉ (22.2 - 27.2 ℃)
PH7.2 - 8.0
GH10 - 25
Assassin Snail
Anentome helena
Anentome helena
Assassin Snail
Sssassin snail


They are found in much of Southeast Asia and are native to Malaysia, Thailand, and Indonesia.

They inhabit small bodies of water and are mainly found in ditches or ponds. They prefer areas with sandy or muddy substrates, and these conditions should be followed as closely as possible in the home aquarium.

Other Snails of interest

Apple Snail(Pomacea bridgesii, Pomacea canaliculata, Pomacea diffusa, Pomacea haustrum, Pomacea paludosa, Pomacea maculata)
Columbian Ramshorn Snail(Marisa cornuarietis)
Malaysian Trumpet Snail(Melanoides Tuberculata)
Nerite Snail(Neritina natalensis)
Pond Snail(Lymnaea stagnalis)
Rabbit Snail(Tylomelania gemmifera)
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Diet & Feeding

Assassin Snails will eat almost anything that they can scavenge.

They will consume other snails, mosquito larvae, bloodworm and brine shrimp as well as sinking pellets, flakes, granules, meaty debris and dead fish.

If there is a giant snail population in their tank, then there is often no need to feed them at all.

Sexual Dimorphism

Assassin snails have determined females and males, and are not hermaphroditic like other snails. It is almost impossible to sex these snails, but it is thought that the females may be slightly larger than the males.


Assassin Snails will lay a single egg at a time. Batches of separate eggs often appear close to one another. Each egg is yellowish and is surrounded in a translucent rectangular-like enclosure that is fixed to the aquarium glass, lava rocks, driftwood or other hard surfaces.

A few days later, the yellowish egg will turn light brown. It will then take around two months for the eggs to hatch.

Once the eggs have successfully hatched the baby Assassin Snails will burrow through the substrate as it matures.

The great thing about these snails is the fact that even though they do reproduce, they cannot overrun a tank.

Frquently asked questions about the Assassin Snail

Do Assassin snails eat other Assassin snails?

No, as a rule, Assassin snails do not predate on other assassin snails, even when there are no other snails in the aquarium for them to consume.

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Date Added: 25/08/2020 - Updated: 25/08/2020 05:17:44