I have to find out the plants characteristic and their needs of lighting and CO2 normally. Then pump the co2 with what they needs. Not exceed. Not lack of it.

Beside that, I will check the PH level after 24 hours. And check once before photoperiod and when photoperiod. KH n GH...nope i seldom check. Only check when i introduce any new plant in.

Once I am able to get and maintain the PH level i wanted to. I will not touch anything inside the tank. Unless changing water. Beside using manual regulator, My 6ft running with solenoid which able to maintain the PH n KH very well.

Try to use Photosynthetic Bacteria. It will help to solve all yr unneccessary problems.