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This is what i found. I had been curious myself...

It is an excerpt from the following page at

Aquarium Snails-What to Keep and What to Avoid
An animal that made an incredible splash in the hobby just a couple of years ago is the so-called assassin snail. This is a beautiful, bumble-bee like snail. It is called the "assassin" because one of its favorite food items happens to be other snails. While the assassin is quite small, groups of these aquarium ninjas will actually gang up on large prey items and feast. Beware that they can and do eat other meaty items – I've seen them feast on decorative shrimp (all snails will eat dead or dying animals, including fish). They will also eat algae, though they generally leave plants alone. They do not need to eat snails.
There is no doubt that these snails can make short work of an infestation of pest snails. However, these snails do carry with them a huge caveat. They breed fairly easily, and lay small eggs inside of small cavities or attached to plants. They and their offspring can hide in the gravel. It would be very, very easy for some of these snails to escape into the wild where they may become invasive. With a heavy carnivorous diet, they could put incredible stresses on already threatened populations of native snails and other invertebrates, particularly aquatic insects which form the basis of the ‘food chain.' I spoke to Rachel O'Leary of Invertebrates by MsJinxzd ( about this risk.
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