Hey Christy
I don't have the Milwaukee controller I have the Red Sea but it sounds like the same idea. Have you checked it with calibration fluid?
Some tanks run a high ORP without ozone but 450 sounds high. My controller has a set point accuracy of + -10% so it can drift up to 40Mv at 400Mv. Also readings can be different in different parts of your tank or sump so maybe try moving the probe around.
Everyone's tank is different but mine stays between 325-375 with 200mg running steady. It drops to about 225 after a water change.
Also on my Red Sea you can't set the ozone level unless the unit is producing ozone.(the red light is on)
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Brian
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220g inwall 48"x36"x30"
110g mangrove refug/sump
Poison Dart Frog Vivarium
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