Freshwater dips (same temp, pH and dechlorinated) with about 5 drops per quart Lugols Iodine are good for killing adults. While treating, look at EVERY polyp when closed up for the eggs. They are in little white spirals. Use a turkey baster to clean up the colonies, clear debri and irritate the polyps into closing. Use an exacto knife or razor to simply remove every polyp with eggs on them. You may need to repeat the process again. I think that the eggs take 11 days to hatch, but that's hearsay. Sounds like a lot of work but will be worth it. Zoa nudis can wipe you out if untreated. Heliocoris wrasses are helpful biological control.