I heard that hydrogen peroxide dips are like a 50/50 chance. I have attempted one in the past with my zoanthids and they mostly died and I lost them all. What I do is with a turkey baster lightly flow water and try to clean it off. I also use wooden tweezers and pull of algae if it isn't on there really tight. I will leave links to my products I own so maybe you can save a nice pipe organ coral. Hope this helps you out my friend.