Something funky goin on

So I was taking some pics of the tank today and noticed a few of the SPS are looking a bit rough, but only on the undersides. Its almost like the tissue is rubbed off. Here are some pics so you'll see what I mean

Very odd. I dosed coral snow the other night, perhaps it has something to do with that? Beats me, I hope they all heal up though. There were a couple others that were hard to get photos of.

Not much else new, I managed to get a few more photos so I'll just leave it at that :)

And a FTS! :)