Palythoa Eating Amphipods?!

The photo above is a picture of my absolute favorite palythoas. Exactly one week after the photo was taken, my frag started showing extreme signs of stress. Each of the polyps were closed…actually, would closed and open. You could see the tentacles and mouth being choked off by the stalk of each head. I immediately started checking for any zoa pests. Nudibranch? None. Heliacus snail? Nope. Zoa pox? Negative. I've fought zoa pox in the past and it definitely looked completely different, so what was this new affliction?