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Re: PO4 "buffers"
I use Flourish Excel, and it does not change the pH of water - you can't use
the pH/CO2/KH charts to figure out how much of it is in the water column. I
did want to mention another possibility for water parameter changes in the
tank, which is water parameter changes at the tap. I noticed the same
startling thing one day - my KH which had usually been around three was
suddenly around 1! I had been playing with the amount of CO2 I was
injecting, and the amount of fertilizer I was adding - could better plant
growth be robbing my water of KH? In this case, no. What had happened was
that the water company changed water sources from a local reservoir to a
more distant one, as they do every year, and the two water sources have
decidedly different characteristics. This may not be what is going on, but
it is always worth checking that the tap water hasn't changed.
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