I'll just keep him in a floating hatchery until I can take him back to the story I got the live rock from. It seems I have never been able to keep any of the interesting critters that pop up on the live rock I getI wouldn't trust any crab with them. They are opertunists so slow moving fish are often on the menu. You should be able to trade it in to a lfs for credit though or trade to another reefer as these crabs are liked as a novelty.