Weird how things are like that. Maybe the leathers are reacting to something leaching from the new rock. The only one I am concerned by look is the toadstool as the stem looks in rough shape. I hope it all pulls through after the water changes and carbon.
The GSP has some algae, but usually not an issue for them. Maybe blow off some of it with turkey baster.
None of those strike me as issues. I do a see a gorg in the picture. How has it been growing?
I ask because some of these guys will really disturb other corals when they kick into growing nicely. Had a gorg tank for years. If it is a Grube's gorg it will be fine.