yup i would think about doing a peroxide dip!!! works real well and not harmful to zoas/palys!!! Revive will not kill zoa eating nudibranch, and you will notice that your zoas skirts will look chewed, main sign of a ZENB and most of the time they will take on the color of the skirt they eat. Some say that Yellow (not so coris) wrasse will pick them off. But good luck my rastas are my favorite, and even more then my Utter Chaos! but yeah try peroxide dip if signs of infection/disease/algae/bacteria/pests and for the poison I would run Chemipure Elite!!!