Randy Holmes-Farley
Reef Chemist
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This was a very important insight. Previous calculariins actually worked better with the lower ratios (eg 5:1). This makes the correct ratio even more predictive.
I do not think a ratio is a useful tool in setting or evaluating target nutrient values in reef aquaria. If has obvious flaws (both N and P too low, for example) that are not present when considering the actual levels instead.