yeah, i'd definitely have shells of various sizes/shapes available for them. if you don't they can get agressive toward each other or any snails you have in the tank. hermits can be pretty nasty, but they sure are entertaining.
yeah i like watchin them....fast lil boogers too.......i think my 2 blue foot ones where mating? they where opening to opening for about an hour and then off in their own direction they went....