GSP sounds fairly tough from reading other people's experience. I recently added GSP to my aquarium. In my experience (n=1) they are close to indestructible. I didn't know how to glue it to the live rock, so I just took that epoxy stuff from Fluval, pressed the epoxy on the live rock, and then pressed the purple mat on the epoxy hoping it would stick. In the process I'm pretty sure I crushed a few polyps hidden in the purple mat with my thumb. And I didn't acclimate them. Oopsies. Within a day they started to come out and a few days fully out. This is at top of the rock, high flow area under a aquaclear 50 output. The purple mat has already overgrown the epoxy edges and a thick carpet of GSP polyps are constantly out except during pitch dark hours. So I'm not sure it's necessarily true that GSPs don't like high flow or high intensity light. They do seem indestructible though.
Moving it around within a day seems a bit premature?