If memory serves, marguerite snails are intertidal. They will likely eventually crawl out and you'll find shells in the oddest of places. The others you listed should stay in though.
I recently found a 10 foot slime trail over my carpet left by a bumblebee snail that started by my FW tank and ended up in my netcentre. Found the thing, looked totally dessicated and dry but tossed it back in the tank and he was still alive.
Stupid snails.
PS. Everyone seems to spell it "margarita" but I think that's actually a yummy slushy drink instead.
Which I am now in want of one. But I'm a work so I can't. So, um, yeah, THANKS A LOT !
