Your old CO2 level might have been trapped in the drop checker too. But since you put in new reactant and new air, you'll get the correct CURRENT reading. I've never noticed the color to go back down to blue. For example, in the morning when the CO2 have been off all night, it should be blue, yes? But not for me. It's always green. Maybe it's just me.
I'm still having issues with my tank. I've narrowed it down to my darn loaches. They disturb the substrate too often and it's murky a lot of the time, triggering diatoms, dust, spots algae.
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