All good points by
@Jon's Reef, next step after after lugol's is a furan-2 dip. This antibiotic targets both gram negative and positive bacteria.
As for zoas spitting out their guts that's usually never a good sign. It's possible it might recover but you'll wanna do that dip. In the event it is a bacterial issue breaking the frag and remounting is usually a good way to go.
For the Predator zoas in particular they started popping up last year. Through vendor friends I saw wholesalers offering colonies of 30-40 polyps and they were widely available to any vendor that was willing to pay the premium. So, there's an extremely high likelihood that if you own predators they were fragged off of a wild collected or mariculture colony. This is also why they lost their value so quickly and are so readily available. Now, all that being said, some have adapted to aquarium life pretty well, but you're not dealing with something that was conditioned for months and months in an aquarium before being sold out into the hobby hence why some people are having mixed results. Will they be slow grows like hallucinations, fast but unstable growers like speckled kraks, will they be like strats where nearly every last one crashes out after a year? Time will tell.