Ok,when I decided to start useing CO2 I had to run a closed system.air cooled enclosed lights,air conditioner, dehumidifier.
The res and air pumps were in the same room. after installing the CO2 instead of the Ph rising 0.1 point daily, it started dropping off,and the ladies started getting spots and looked sickly.why? because the air pumps were bubbling in 1500 ppm C02 enriched room air.
moved the air pumps. don't think they liked CO2 in the water