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Pore water ammonia running 0.1 - 1.0 ppm (API, Salicylate method, centrifuged test sample measured with Hanna Alkalinity Checker), depending on location but no apparent pattern. I suspect the very fine sand and depth may have created anaerobic conditions. I have restarted monitoring the pore water while I carbon dose with acetate.
“Trying to figure it out” referred to cyanobacteria mat formation. By the way, I now have two new cyanobacteria species taking over duties for mat formation. Unfortunately, I slacked off microscopy work and missed when the transition between species occurred.
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