Duncan Coral Shedding skin.

[Reef Devils]

My Duncan coral has had some of its skin peeling off. Not sure why. You can see that the white spot is where some of the peeled skin is gone. Here is a video and pic.

 

[blaxsun]

What are your water parameters? You could try a dip...

 

[Reefkeepers Archive]

Mine did something similar. Mine Wasn't peeling, it was recession from a sponge irritating the base. Just plucked it off, though it did eventually grow back