I just started my crab tank yesterday, and this morning I went to mist the medium I bought, not realizing that a crab climbed up it. He fell about four feet. I picked him up and carfully put him back in the habitate. He stayed in his shell for about a minute, then got up and walked into his hut. What are the chances that I injured him beyond help, and how long will it take to know this? Boy am I stupid, or what.