Yep, that is them. I dont' think I will even try them. They need quite a deep sand bed and from what I have heard are quite hard to keep alive. With my chocolate chip star and my urchin I have a nice clean tank. No snails for hermit crabs needed here. I have spent so much money on snails and crabs before the star and urchin if I would have only done this sooner.
I do supplement their feedings though, I don't believe any tank no matter what size it is gives them enough on their own to survive well.
Thanks for the reply.....loki