@Thor2j Algae and coral have similar light requirements, BTW. So if algae won't grow...
The only way this is contributing is indirectly. If there are corals in that zone, they're gong to be at least a little light-deprived. That'll reduce their potential metabolism of NO3 and PO4.
The only way this is contributing is indirectly. If there are corals in that zone, they're gong to be at least a little light-deprived. That'll reduce their potential metabolism of NO3 and PO4.