Anthelia is easier to get rid of than clove polyps. They are very similar species but clove polyps grow low to the rock and are almost impossible to remove. I finally haulted a clove polyp "issue" by covering all patches with epoxy and cyanoacrylate. The same should work w/anthelia. First remove the main stalks and then be sure to cover the remnants with a nice blanket of epoxy and cyanoacrylate.