Yeah, they're definitely cool looking crabs.. I've got one in my tank that was a hitchhiker, Like others have said, I very rarely ever see him. When I was cycling my tank he came wandering out of a rock. (I actually posted a thread about it) I had no idea what it was. I got a glimpse of him yesterday while rearranging my rock. Those are the only 2 times I've seen him in 8-9 months.