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Mine turned white in the cycling process and is still a skeletal structure. I since have had new groups pop up and do great. Not sure what it is though- sorry
Since you just got your rock it is likely just part of the travel process. I'm sure you'll see them bounce back in no time. Keep testing your water and be prepared for a change if need be but you'll probably be fine.
I got a lot of that stuff from the rock I picked up from TBS. Mine was white when I first got the rock and now it has all turned back to the normal color.