This is a bubble bee snail.
http://www.liveaquaria.com/product/p...565&pcatid=565
yes those are the one's I have I read the same thing recently and I am getting rid of all the ones I have by just picking them out when I see them but I think I'll have to keep turning rock's around to to get them all out because they are every where
I have noticed a huge decline in slugs and copepods over the last few month's since I really noticed that they spread