According to your post , you are running your lights for twelve and a half hours per day. That is way too long. I run my co2 @ 30 ppm for 9 hours per day. It comes on 2 hours before the lights come on , and it goes off 1 hour before the lights go off. Your co2 should be at the max ppm you want it at for the day , before your lights come on.
My lights are on for 8 hours per day. How are you injecting your co2? What type of lights do you have. Any tank pics ?
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Last edited by rick dale; 04-19-2015 at 01:43 AM.