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Subsea,
Sent you an email about the book link. That is interesting info on what the skimmers can remove. If they could remove 100 % they would stop foaming every now and then. But a well stocked reef tank can constantly produce skimmer foam. So that 40 to 50 % figure seems reasonable. Almost all the nutrients on an oceanic reef are bound up within the existing biomass. What is available in the water column is very minor compared to existing biomass. That is true of organic and inorganic. That is Darwin's Paradox. All that live living in a nutrient desert basically.
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