The Assassin Snail (Clea helena or Anentome helena) is a unique addition to freshwater tanks. While most other snail species are used exclusively for keeping ecosystems clean, these critters have a different claim to fame. They’re carnivores that like to feed off of other snails!

As such, they’re often introduced to tanks that are overrun by pest snails. Even a small collection of Assassin Snails can take care of a large colony of smaller species in a few weeks.

Originally found throughout Southeast Asia, Assassin Snails have become very popular among aquarists. Not only do they serve a practical purpose in fish tanks, but they’re very easy to care for.