My friend's RBTA recently split so I acquired one. It has been wandering aimlessly around my tank for the last two weeks but has now settled down in a pocket of GSP. With any luck, it will nuke them

Awesome. GSP would be fine if it promised not to spread to any other rocks. Even when it is confined to a solitary rock 30 ft away from any other coral, it seems to find its way to where your nice corals are trying to grow. hahahaha. Watch, the gsp is gonna start growing on top of it. LOL man... that would be terrible! keep us posted on how it does!