My neighbourhood LFS has just started selling panther crabs and I feel tempted to get one of those little critters for my semi-aggressive community tank. The tank in question is a fairly large one that measures 5 by two feet. It houses two red jewel cichlids, a striped Raphael catfish and a small school of Buenos Aires tetras. Assuming that I get a floating turte dock for the crab, would he be able to get along with the existing residents of the tank? Thanks in advance.