If I'm not mistaken that looks like good old galveston bay and beach hermits. I wouldn't put them in my reef tank...I've kept a couple in my sump just to keep it clean down there, but I wouldn't consider my display tank the right place for them. Even if they don't eat corals, have you seen how big those guys get? They'll be ripping everyone out of their shells trying to find new homes. Just my thoughts on the matter...I'd rathe stick with tried and somewhat true species.