I run carbon and my blue clove polyps do fine. In the last year they have only expanded maybe 2" of territory but don't appear to harm anything. My SPS just grows right over top of them and they mix in with some of my zoanthids with no problems to either party. At the current rate of growth it'll be about another 10 years before I have a plague. I kind of like the look of them myself but I feel your pain as my GSP is another story.
