wrasses are your best hope in this. Best way to locate them is to inspect when only blue lights are on. My zoas tend to close up at night, and the nudis absorb the color of the zoas they're eating, so they glow nice and bright under the blues, while the zoas are closed up and not glowing. When I had these lil (*&(*^*&^ in my tank, I tried dipping for extended periods of time in coral QT, and it did nothing. Bayer killed the adults, but nothing touched the eggs. Eventually I just tossed all of my zoas and started over with new ones after several weeks (so the existing ones would die for lack of food). And I got a 6 line, coris, and sunset wrasse.