orp rocket up every morning

[dbq5anlxj]

I know that actual number doesn't mean anything. I just want wonder what may be the cause of this. The orp number go up rapidly (from 320 to 365) everyday from 10am to 11am. Light is on from 9am. No fuge. Not dosing anything at that time. Thanks

 

[Jay Hemdal]

I've seen dissolved oxygen levels influence ORP values. Looking at your pH, and the time the lights are coming on, I think you're seeing a normal fluctuation between night/day due to photosynthesis.

You could try turning the lights on a couple of hours earlier - if the trends shift equally, then I'd say that is what is going on....lower CO2 and higher DO once the lights crank up.

Jay

 

[dbq5anlxj]

I've seen dissolved oxygen levels influence ORP values. Looking at your pH, and the time the lights are coming on, I think you're seeing a normal fluctuation between night/day due to photosynthesis.

You could try turning the lights on a couple of hours earlier - if the trends shift equally, then I'd say that is what is going on....lower CO2 and higher DO once the lights crank up.

Jay

good idea. I'll run the light two hours earlier see how it goes. Thanks