Zoa Eater with "A" on its back???

[MaxxuM]

My zoa's were slowly closing up on one side and I tried for three days and nights to try to ID any problem. Today I matched the photos from a week ago and noticed zoa's were disappearing! I finally found something and I'm preping an emergency dip right now.

This was a week ago...

These pictures are from a few minutes ago. I saw something with the letter "A" on it's back shifting in a crack. It kinda looked like a roach at first but I cannot get a good enough photo of it.

Also, notice the nodule on one of the Zoa's? That wasn't there a few days ago either.

 

[vetteguy53081]

Zoa eating nudibranch. Find and get rid of it asap and look for eggs it may have laid

 

[MaxxuM]

I've dealt with nudibranch's years ago and this had a segmented body, moved quickly and had antenna.

I dipped the rock for 15 minutes in ReVive with a little pump and a turkey baster... Only smaller pods came out of it. I don't see any spiral shaped things on there either. But something is definitely eating the zoa. I'm getting two batches of saltwater ready for tomorrow and I'm going to dip ALL of my zoa just to make sure.

Any recommendations?