It has one big claw correct?If so it is what is commonly called a left handed hermit. Electric blues,halloweens and zebras are all left handed hermits.If threatened they use that big claw to close over the front of thier shell. As with any crab,excersise caution. I would keep him,I have electric blues and halloweens and they are good algae and leftover eaters. I have had no problems with them.