Green Slimer Issue

[Poriferabob]

Hey everyone! I got this Green Slimer from WWC about two months ago. It has good polyp extension during the day but I noticed that under white lights the color seems to be fading to white in little patches. These little patches are getting bigger and bigger. I was always under the impression that this was a sign of some sort of pest nibbling on the coral tissue but I have not been able to find anything. Most other corals doing fine but for some reason, I always have issues keeping green slimers. Any ideas?

 

[Big G]

Bump

 

[Dilan Patel]

COuld be AEFW or a fish picking at it or shading of somesort. Can we get a little bit more info about your tank.

 

[Poriferabob]

Thanks for the replies everyone!!
Welp.... Definitely AEFW!!! Man those little bas**rds are hard to see.