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CO2 Level
Since installing a pH probe and controller, I've been pleased with the way
it holds the pH steady at 6.6, which, according to the chart, when
combined with a KH of 4, provides me with a CO2 level of 30 ppm. Ideal, I
thought.
But this new instrument also reveals that during the night, when the
lights are off, the pH usually drops to 6.5 or even 6.4. When I look up a
value of 6.4 in the chart, it says I then have 47 ppm of CO2. My
understanding was that level is too high for the fish. On the other hand,
I haven't noticed any unusual behavior, much less die off, on their part.
So, my questions are: Should I be concerned and, if so, what do you
recommend? Thanks.
John T. Fitch
www.fitchfamily.com/aquarium.html