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I have zoa eating nudibranchs. Sucked out 30 yesterday. I have read several articles and posts on other sites about using FWE against them. Most of my zoas are where I can take out just the rock they are on and dip the rock. However, I have some on the main rock that cannot be removed. So I am thinking treating the tank may be best. I know I will have to do at least 2 treatments a couple of weeks apart for newly hatched nudibranchs. Is FWE really reef safe? Has anyone had experience using it? Any gotchas other than following the directions on the package?