The coral will likely reject it as some point, but who knows.
I am somewhat surprised that it pulls apart unless it is growing in a very thin fashion. Even in my small systems the stuff is so strong will lift rocks larger then softballs before breaking.
In addition, I find cutting the pieces releases less algae goop, a technical term, back into the water.
Is the macro firmly attached to substrate?
btw: if it established, scrubbing will not make much difference, it seems to return in my tanks.