They just don’t die. I pulled a rock out to kill off the palys and drill frag plug holes for zoas. Rock was soaked in h2o2, left in the workshop for hours, drilled. Stuff that would be terrifying if there was a single wanted coral. Two weeks after it was back in the water, the grey palys are growing faster than before. Didn’t want to bleach it and kill bacteria. Should have baked the thing in my oven. Someone needs to genetically modify all of the things I can’t keep alive with a touch of ugly paly genes. They would make a fortune.