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> Date: Sat, 28 Oct 2000 20:55:17 -0500
> From: "Len Kutz" <len at kutzfamily_net>
> Subject: HCL dosing
> I recently purchased some 20% HCL and have been dosing a small amount every
> night trying to lower the ph of my tank.  It is a 75g tank with tap water
> that is about 8.25 ph, 100+ ppm GH and 120+ ppm KH.  For the past 4 nights
> I've added 15-20 drops of HCL to the sump.  Every night I measure the ph
> before putting in the HCL and about 2 hours afterwards.  Every evening
> before putting in the HCL the ph has been up to or very close to 8.25, but
> after adding the HCL the ph drops to about 8.  I'm concerned about dropping
> the ph to quickly, but I didn't expect the ph to keep going back up so much.
> Am I doing something wrong or is it the buffering of the hard water causing
> this?  Should I put in more HCL?  Any suggestions would be appreciated.
> I've been very cautious doing this and so far none of the fish or plants
> show any signs of problems.

Try using CO2, you and everything else will be much happier. I have water
close to the KH and much harder on the GH than yours. You should only use
CO2 to lower the pH.
Tom Barr