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It could hurt part of them, but the aiptasia is guaranteed to kill them.
Use just a few mL, administered directly to the mouth of the aiptasia. Most likely your zoas will be fine. Worst case, a couple of heads close up for a few days.
Just zapped that s.o.b. and two other little ones on my other zoa. They looked more like little feather dusters but I'm not takin a chance! Thanks for info and help today!