Hey there, I am using lab-grade ORP probe (I believe it's Pinpoint Marine off the top of my head) in my 48 gal freshwater planted tank. I do have an ozone reactor, but it's never on (I'm not entirely sure it works, anyway, it never seems to raise the ORP when it kicks on, but It's not apparently hurting anything) BUT I was wondering why my ORP is over 500 mV without any Ozone being used at all? Is this problematic? The probe seems fine and has been in the sump for a couple of months. It's clean. Tank is grounded.
I have recently set the pH controller to stay on 24/7 instead of just during the photoperiod. This is the only factor, that I can think of, that has changed. Everything I have read indicates not to let your ORP rise past 400, and certainly not 450. This advice was in the context of SW husbandry, however.
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