I would get some more water ready for additional water changes, but test again before you do it.
For nudibranches and flatworms, I've tried freshwater dips (same temp.) and watched them float off. I dip the rocks with the pests on them and they reacted by letting go of the rock while in the fw and I just quickly swished the rock back and forth. Don't know if this technique will work for you, but it did for me. I dechlorinated the fw dipping water first and made sure temp was similar to the tank water. A few seconds in fw should not adversely affect the live rock or zoas.
Anthony
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