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Dissolved carbon dioxide would actually lower the pH since it makes carbonic acid.
Water pH is a pretty delicate thing, especially around 7. It doesn't take much of an impurity to change the pH in either direction. It could be that dissolved CO2 has lowered it. At a lower pH, you are likely reading ammonium and not ammonia, so the two are somewhat buffering each other.
As for your other questions, time will take care of the ammonia (three days isn't very long yet and you are already well on your way because of the Bio-spira I assume), raising the temperature will probably help speed things up and leaving the light on all day could potentially lead to some algae problems.
Last edited by K. Sear; February 24th, 2008 at 10:21 PM.
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