I think i have a Zoa eating worm!

I have noticed recently that my once flourishing GPE were receading - I thought nothing of it and just put it down to another failure to add to the list.
At the same time i have noticed a worm like trail, almost like an encasing going from a rock to my RPE.

Looking at my RPE's now, they are half gone and one of them is literally half gone, clearly something has been nibbling!

Not to sure what to do, the rock that had the trail going to it, is now in a bucket of fresh water to see if anything comes it. other then that, im not sure!!

Any ideas?

 

bump........

 

well for now, you can try moving the rock the zoas are on to maybe delay the damage somewhat. I looked around and didn't see much on worms eating zoas, there is of course the nudibranch that eats them. Maybe try freshwater dipping the zoas to see if something is on that rock.