My drop checker (kH approx 5) still reads green the next day before the CO2 comes on again, which I guess is a good thing, but it surprised me. I confirmed that when I remove the drop checker from the tank, after a few hours the color is a deep blue (approx 7.5-7.6 pH).
I expected that much of the CO2 would outgass overnight, but I guess I was wrong. I run my spraybar horizontally at one end of the tank, angled slightly downward, which produces a slight surface ripple. |