Rodi comes back zero due to no active conversion to over report. Among false positives we can search online, api is a third, Red Sea a third, and salifert a third.
there are also times those show zero, results are mixed. If you check my threads linked you’ll see it’s not the single point reading we use, it’s motion. Your whole thread hasn’t been about increasing ammonia, it’s been about a single point (misread)
prediction: you may have lost an sps overnite, because those are sensitive
but no fish, during your lowest oxygen period where true ammonia burn would make them seek oxygen at the top, because you have no free ammonia. Nothing else has died.
if I get two predictions right u gotta consider today that you have been misreading the entire time. Post pics when lights on

B