You can suck them off. or 5-10 minutes of freshwater dip will kill the nudibranches. If you can adjust the pH of freshwater zoas won't get stressed out that much. If you shake the rock well the dead ones will drop from the rock. Also you should scrape the egg sacs othervise even if you kill nudies eggs will hatch.Freshwater dip don't kill the eggs. I haven't heard any other working ways to fight with nudibranch.
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