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IMO, the ratio in the water does not relate to the Redfield Ratio.
In other words, the ratio of things an organism takes up should not be reflected in the concentrations in the water.
For example, corals take up way more calcium than magnesium, and roughly the same calcium as "carbonate" and yet there's way more magnesium and way less carbonate relative to calcium in seawater.
this is true for coral.
not it's symbionts that give the coral it's coloration.
Surface seawater (where reefs are) is typically less than 1 ppm, and often less than 01 ppm.
this is true as well.
but they are all brown and not bombed with our 1000w sun panels.
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