Pest, Disease, or other?

[ctyler85]

I just noticed this last night on one of my Millies, Non of the other SPS corals in the tank seem to be affected at all. I am going to be doing a water test here soon before the water change. Last time I saw this happen it was flat worms but I cant seem to see any on the corals.
DSC03586 by Titan-Uranus, on Flickr

 

[Mike J.]

Are you going to take it out and dip it? Have you looked with a magnifying glass? Usually tissue necrosis will start at the bottom and go all the way around. You might even want to snip it off in order to save it.

 

[ctyler85]

I'm going to pull it out in the morning and take a closer look and dip it, its been a crazy busy day so I didn't get to do much tank maintenance as I had hoped