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Dissolved CO2 Question
I have a question about dissolved CO2. I have a heavily planted 30 gal
aquarium with fluorite in the substrate and 60W of light. I had a diy CO2 set
up into the filter intake. My KH is 8 and a pH of 7.0. I checked the
dissolved CO2 (test kit from Red Sea) and it said it was 40 ppm, I checked my
20 gal tank that has a slower bubble count and it was 30 ppm (also heavily
planted with the same conditions). Finally I checked a newly set up tank
(about a week old) with nothing in it but gravel and it read 16 ppm. My water
is a mix of 2/3 RO and 1/3 well water (yes, it is tough with a well). Is this
possible or is the test kit wrong? BTW, the thirty has 4 otos and 6 cory's
all doing fine. The two twenties have no fish. My chart of KH to pH says it
can be a maximum of 24 ppm.
Confused,
Sean