I don't know how I didn't see these until this morning, but I have some purple clove polyps that are covering some of my rocks. About a year ago, I got a montipora frag that ended up having some of these growing on it's underside and they started to spread. I knew I didn't want these pests in my tank, so I threw out the montipora other than a small clean frag and chiseled away the rock and got rid of the pieces that had the clove polyps on it. Well it looks like I missed some and only just noticed today, and I discovered them on 2 different pillars. I do have my rocks in acrylic rods and can pull them out, but there is also some SPS frags that have encrusted on these rocks. What would you do? I've heard some reefers just let them spread in their tank and live with it while others dona complete tank teardown. Some add urchins and others use chemicals. Feeling really bummed about this and looking for advice.