I know they’re bad quality photos, let me know if I should buy a better microscope. Have this brown layer on my sand comes and goes with the lights for the most part. Possibly cyano? Under the microscope the look like a bunch of brown little specs, some looked like they may have been squirming around? White chunks in the photo are grains of sand. Parameters are mostly in check. Phosphate 0.3 and high nitrates 75+
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