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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

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