Yeah, I still remember when I added dry rock to my tanks a couple years ago. Despite cycling it in my QT for a couple months, with lots of rinsing, I still had a little P04 spike after adding it to my display tanks. However, it was well mixed with my existing live rock (50:50), so didn't take too long to stabilize in the tank. But it took quite a while longer before coralline finally covered it, and it ceased trapping detritus (which the GHA loves).
I don't know how the guys that start with only dry rock do it. Must take a long time before it becomes fully live the same as regular live rock.
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