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Results of regulating DIY CO2

Thanks to everybody who replied to my email a few days ago. 
I was concerned that I was putting too much CO2 in my 29 gallon 
tank with a DIY CO2 system, because my pH was going down dangerously.

It turns out that, as most of you suggested, I wasn't putting too
much CO2, I just have a very low KH. So I went, bought a KH measuring
kit, and... it was so low that I thought the kit wasn't working. 
I guess the water around here has a KH < 1 (and the pH is around 7.2-7.3).

So I followed the advice from this mailing list and the Krib, and added
a small amount of sodium bicarbonate. Now, my KH is up to 2, and the
pH has risen accordingly to around 6.8 (which I really like). Also, it seems
to be much more constant than before.