CO2 advice

[Tom R]

Hi Marty

What is your PH after your lights have been on for 4 hours or more.

My Ph falls to between 7.89 and 7.92 during the night and then climes to between 8.2 and 8.3 during the lighting cycle. This is not a swing that should cause any problems.

Some people try to compensate for this by running the lights on their sump on a reverse cycle.

I am running the PH in my CA reactor at between 6.5 and 6.6. I then run the reactor effluent through a second CA stage with no CO2 added. This helps raise the PH before the effluent returns to the system. It is only a partial fix.

Tom