Did water change today. Noticed two asterina starfish attacking 2 separate paly polyps. One on my purple monsters and another on the pink mowhawks. Sigh.. I see them pop up like vultures if I damage any polyps, but these showed up on healthy undamaged palythoa polyps. Makes me wonder what they are normally eating. Also...only the bigger individuals seem to be coral eaters. Have not yet observed this "glomping" behavior by the small variety. Maybe the small ones dont eat coral?