Sorry, snowed in and no power.
It is all about who is in charge of the nutrients. The more you feed the more in control the coral is and not the Zoax. As long as the flow of Pi is higher in the coral than outside. All is good. We fall into the trap of starving the corals to keep the P from building up.
G~
Yes, but how do you initiate that flow into the corals while still managing to keep things thriving? This, at least to this novice, is where the "magic" lies.