K keepsake Well-Known Member Oct 4, 2017 #1 I use a tank with a timer. 15 on 30 off. My ppm levels swing from 500-1200 up and down. Is that harmful? Without co2 at all levels are constant at 500. I was just wondering if swinging levels can actually hurt more than help.
I use a tank with a timer. 15 on 30 off. My ppm levels swing from 500-1200 up and down. Is that harmful? Without co2 at all levels are constant at 500. I was just wondering if swinging levels can actually hurt more than help.
