No they are pretty hardy. I've had two in mine since I finished the cycle and have had no probs with them. They each got part of a leg bit off by my sally lightfoot but are healing nicely. If you are planning a reef you might want to be careful since they say they aren't reef safe, but mine haven't touched my corals. In fact when they come up to the corals they lift their leg and completely avoid them. As far as feeding goes I only feed them a little chunk of shrimp once every 2 weeks and the rest of the time they eat whatever they find in the tank.