Red Sea..Aquazone Plus
 

Having reading swing over a 100 points [ from 367 down to 189 ]
Ozone-mg/hr set at 98...
How does one go about setting it for around 40 point swing?
Nothing dead in tank:onfire:

Is the Aquazone Plus variable? Regardless, the safest way to do it is with an ORP monitor/controller.

The Aquazone plus is a monitor controller, the set point can vary + or - 10%.
Not sure what your asking but with the switch at set point you dial the desired ORP level.
Did you do a water change? My ORP can drop a 100 points every time I do a change. Moving or cleaning the probe can cause a big change as well.

If this is brand new unit it take long time to read stadily. (should be in the manual)

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The problem I had is no longer a problem...As what was explained to me by a friend, that at times when probs are to close together they may interact, so I moved ozone prob to the far side of prob holder...all is well:rolleyes: