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Re: CO2 Level

Shouldn't a PH probe and controller avoid this from happening? Wouldn't it
just turn the CO2 off at night when the PH dropped to the set value? That
was my understanding of using a PH controller with a CO2 setup. You could
airate or increase surface agitation to release some of the extra CO2 at
night but I still feel the PH controller should be taking care of this for
you. What am I missing?

Giancarlo Podio

----- Original Message -----
  a.. To: "Aquatic Plant Digest" <aquatic-plants at actwin_com>
  b.. Subject: CO2 Level
  c.. From: "John T. Fitch" <JTFitch at fitchfamily_com>
  d.. Date: Wed, 5 Feb 2003 17:15:11 -0500


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