I had a 2 inch long blue devil damsel that killed every living thing in the tank with it. That included 8 other damsels over the course of 3 months, a four inch long maroon clownfish, and a yellow tang. He was a real jerk.
Actually, that was his fate! I used him during my first cycle (I was unaware of the fishless method at the time) and he had gill burns and a bad attitude. I therefore traded him to a friend who owns a large volitan lionfish for a turbo snail. We never saw the coup de grace, but the damsel was no longer an inhabitant of that tank after the third day.