I just picked up some frags from a local reefer since I missed the Detroit Area frag swap. He a few corals that were infested with the red copes. I don't have any yet in my tank and don't want them, so I went to my LFS and purchase some lugol's and a few capsules of erythromycin which is used to treat cyanobacteria (red slime). Before adding the frags to my tank I treated them with a strong solution of 1/4 capsule and about 5 drops of lugol's in about 1/4 cup of water.
My observation was that the copes shook the buts very rapidly, then they jumped off of the frags. The ones that remained on the coral were dead still. I left the frags in this solution for 10 min. then I put them into my own tank water.
The copes were dead, even the ones that clung to the frags. The clingons were later brushed of with a small water color sable brush. I can't say for sure that I don't have them in my tank, or that the corals were not harmed, so I will keep all posted.