Kenny zoas tend to be very susceptible to ALK swings, I have personally had a few colonies die because of it. It's really hard to generalize what will kill one species over another as zoas are collected from so many different niches around the globe.
I would do a water change and then run some fresh carbon, that usually tends to help. The other option is an iodine dip if it's some sort of pest, have any close up photos of the colonies on hand?
One of my favorites (The one with a long yellow skirt and a bright orange ring) that I got from you just got up and melted the other day. So frustrating to see it happen, sometimes I wonder why they are classified as easy to keep considering my mortality rates over my SPS and LPS.
**actually I just noticed the ones that melted are the ones in my avatar.
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