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Discussion Starter · #1 ·
I know blue is low CO2, dark green is a good level of CO2 and yellow is high CO2. Mine for the last few days has been a medium green, definitely not dark green. Is there a medium green color on both sides of the dark green level or is the lighter, sort of washed out green on the side headed for yellow? The pictures I see posted here show that you should go from blue to blue green to dark green and then it gets lighter, but I never saw that dark green.

I am using a Cal Aqua checker with the ready to go indicator solution. Over the last week I have slowly dropped my pH from 8.26 to today's reading of 7.05.

Thanks
 
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