Newgrowth on my GSP is usually light colored and whitish on the edges, it actualy gets a dark dusty purple color when it is dying off, IME. Maybe the GSP is about to grow over the buttons? I had a colony in my 10g just engulf a kenya tree frag, and in my 40 is is slowly growing over some yellow polyps (that are almost as evasive as it is). It is also slowly covering the back wall of the 40G. Nice speciman otherwise.