So my girlfriend and I have a total of 3 crabs now. I just bought another one last night for her. I have 1 and she has 2 they all live in our new 30x30x30 glass tank I got just the other day. We put in a nice pool area, few things of drift wood and some shells of course. The one we bought last night seemed to ramsack the tank last night though, wood was pulled outta the sand, water was GONE, sand in its place. Is he just de-stressing? The crab I got was a gift from someone who had him for about 5 months before I got him hes about the size of a tennis ball so I havent really worried about the stress stuff before.