well I am in the minority here, as I just recently found one of my semi-picassos being munched on by my CB shrimp. Now I too thought the fish just died, and the cb was taking advantage of an easy meal, however, today I walk downstairs, and the cb has my other semi picasso clown in his pinchers, dragging him into his cave KICKING. I poked @ him with my net, he let my fish go, and the fish is up, and swimming. so in my experience, YES, the CB's can be little bastards