On Mon, 3 Nov 2003 22:37:52 UTC, Chuck Gadd wrote:

On Mon, 03 Nov 2003 13:32:46 -0800, Dave Millman
wrote:

Water of KH2 is no mor prone ot pH crashes than any other water. A pH crash
occurs when KH drops significantly below 1.

I agree.

Just keep an eye on it, and a KH of 2 is perfectly fine. But, the
normal nitrification process in the tank can lower the KH.

KH of 2 is a little closer to reaching that "crash point" than a KH of
3. And a KH of 3 is a little closer than a KH of 4.....

But, returning to the original query, he's setting up a planted tank.
With a KH as low as 2, the pH will have to be kept below 6.8 to provide
enough CO2 for good plant growth, or so goes the received wisdom, e.g.
http://www.sfbaaps.com/reference/table_01.shtml
which may not be a problem at all, but something to keep in mind.




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Dan Drake

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