Probably an increase in photosynthesis. Watch and see if your ALK starts to drop.
I'm sure there's some latitude, but a boost in JUST photosynthesis should lead to nothing more than earlier (in the day) photo-saturation. Unless nutrients and flow are also increased, there should be net-neutral photosynthesis.
Again, still and interesting detail to watch....the corals don't listen to the theories outside the box!!!