Contact any fishfood manufacturer, and ask him how much phosphate is contained in the feed. Eutrification occurs as low as .3 ppm phosphate, but worse, even without the eutrification, phosphate restricts growth at 3 ppm.
The trick is to lock the phosphate into a food without depleting the oxygen from the water. We do that by adding the nutrients required by the biofloc over a specified time period to assimilate the phosphorus and by restricting the nutrients over time so that the bloom is controlled as to not deplete the oxygen.
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