are we talking about inorganic nutrient levels or organic nutrient levels?
i have no doubt that the more light one puts over a tank the more organically bound phosphates need to be added. i do not think the inorganic phosphates levels matter as long as they are within oligotrophic levels. a PO4 level of 0.02 is still way above the oligotrophic level of 0.009ppm.
G~
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