Already have my tag.

Not sure about the "evil" part, but snail killers they most certainly are. Gave 20 to the lfs this week and probably 20 more next week. That should make my tank crab free. (I got rid of the large ones first now I just have really small ones so I figured I could do it in stages.)
Soon to have a "crab free" tank and much safer snails.

Peace
Lynn