when you changed your lights did you acclimate the tank? only thing i can think of you doing would be to put them on the bottom of the tank and off set them from the halides until they start to look better.
is that the only thing that has changed in your tank? what are your parameters like?
Did you acclimate your system to the new lighting? I would guess they have suffered light shock. That being said, zoas are pretty resilient and should bounce back over time. How long ago did you change your light?
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