I always freshwater/iodine dip my zoas before they go in the tank. I thoroughly inspect and clean off any non-zoa material as well. It's rare that I don't kill a nudi or two esp.
from LFS stock.
Yeah great advice I guess I need to start. When I didn't have a lot invested in corals I wasn't so concerned, but now it would be a much greater tragedy to introduce a pest, I am dealing with Monti eating nudies now in fact.