My CBS is not that mean but he does swipe at fish and other shrimp. They all know to stay away. When I moved my tank he lost one of his big arms. It took 2 molts to get it back to full size but he is back to normal now.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,