My brother got a little fiddler crab at Wal-Mart last summer to put in the fish tank. At first, he was teeeny tiny, and hid all the time. About 4 or 5 months ago, he grew big enough to feel comfortable around our giant goldfish, and started coming out more. He's been really fun to watch. We have a bridge thingy so that he can get out of the water, and feed him algae pellets occasionally. But now, for like the past month or so, he's been going to a high place (on our castle, or the underwater portion of the bridge) and doing a strange dance thing. He waves his claws above his head in weird jerky motions. My mom and dad joke that he's trying to be a Kung Fu fighter, lol! But, he's been doing this for weeks, with increasing regularity. Is he lonely? Should we get him another crab? Thanks for your help!