Total system water in system #1 = 280 gallons. Total system water in system #2 = 725 gallons (these include sumps and grow bed volume). ph in system #1 is 7.9, system #2 is 8.3. Just transplanted plants into both systems. I know with the high ph, iron uptake will be an issue. How much Maxicrop Plus iron do you Maxicrop users recommend?

Thanks!