[karimwassef]

N and P are below measurement

My corals grow at a frantic pace because there's food (organics) in the water, not inorganics.

There's this myth than there's a minimum N and P needed for healthy coral growth and color. In the wild, healthy natural reefs have no measurable inorganics but massive organics. The normal food/waste cycle provides all that is needed for zooxanthelle to work.