WtF is happening to my Palys?!?

[Zoaelite]

I doubt it's pests, same thing happens to me all the time. Zoanthids/ Palys are funny this way, all of my SPS is doing stellar but I have reoccurring fungal/bacterial/ something infection which makes whole colonies melt away to nothing. In the last two months I have lost a massive dragon eye colony, my massive Bam Bam colony, Nuclear greens & Purple deaths + Magicians.

I have a theory that some sort of irritant (Astrinias, fish, moving the colonies...) causes a break in there immune system. As soon as there is a cut infection takes place and it's a fast demise for our little zoa friends.
Frustrating but at this point I would throw that colony out, what ever is causing it could be contagious.