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In my limited experience of monitoring my ORP, my 120g thriving SPS tank barely hovers above 200, if even, often hovering around 180mV. I do not dose ozone, but monitor ORP to look for tank changes since I've got a web accessible aquarium controller, and am away from my tank for very long lengths of time (3-7 weeks at a time). I feel that while my family are watching the tank, they frequently don't notice little changes, and little changes are never without consequence in a reef tank. I feel that ORP is just a back-up monitoring system.
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