hi- at the local pet store they had a 20 long stocked with roughly 7 of these guys. they were big, maybe the isze of my fist, redddish with hints of brown on their carapace, and they were motionless. some were on floatable island and others were in the water hunting the feeder goldfish. ive never seen these guys before and am curious if anyone knows anything about them. they were labeled "moon crabs" for 10 dollars. i have to admit, i am tempted to buy one cause they looked really cool, but what do they need for food etc.? thanks