A few thoughts on the GSP...isolate it. Put it somewhere where it can't spread to the other rocks in the tank. I would pay money for something that would eat mine, they are taking over.
If you figure it out, kevin - let me know! I still kick myself for the day I decided to put star polyps and mushrooms in the tank. It's been an ongoing battle for well over a year now. Hate the stuff! 8O