Something different is going on :idea:
Alfred Redfield based his 1934 paper on water samples he took in his travels through the worlds oceans. His conclusion initially was based on the presumption (empirical) that plankton balanced the resulting atomic ratio of N
in seawater to their presumptive metabolic average as they consume and compete with each other. He later changed his opinion as to the cause and wrote further papers based on the results he'd observed at a time when the research methods to substantiate his findings simply weren't available. Fundamentally his research stands today though the 1:16 ratio is now considered more of a general average.
What we're observing with Siporax in a reef tank is simply the efficiency of more diverse and dense bacteria populations resulting in more complete breakdown of carbon, nitrogen, phosphorus, etc. before less complete transformation (digestion) occurs through other organisms that would excrete phosphates.