What is this?

[black42]

found it on a plug of a zoa colony that has been declining for the past month.

 

[N.Sreefer]

On the left looks like a chiton however the two on the right look like nudibranches that collapsed when taken out of water. That's a guess its kind of hard to tell. If it was my tank id pull and dip what I could and mabey get a wrasse.

 

[king aiptasia]

get a better pic, it is either a few chitons or a few isopods, either way harmless