Lugol's solution will work?
Lugols in saltwater will not kill the nudibranchs, you need to do a freshwater dip with the Lugols.
I had a different experience. I performed dips with SW + iodine dip and it worked very well to kill these nudis. I did 3-4 dips over 2 weeks, also examining the colonies for the curly-shaped egg masses. Those need to be picked off with tweezers. It's also important to swish the colony around vigorously to get the nudis to come off. But I always had dead nudis in the bottom of my bucket after using the Seachem iodine dip...I think it's pretty much the same thing as Lugol's.
It's good that it worked for you. Maybe it was the 3-4 dips that did it.
The freshwater dip is more stressful, but with the many zoanthid keepers I know, the proven method has been with freshwater.
Also people say using Flat Worm Exit in the dip helps.
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