The ones shown no, my female (med. sized shown) Flame picks on the birdsnest, but does not kill it. I did have to remove one juvenile Blueface Angel because he killed SPS. The adult Blueface was fine, but since I was trying to create pairs I removed him also. I have a plexiglass divider that I place in the tank and then remove all the corals and rock in that section. Since 2010 I have done that I think five times.