keeping PH low

["the dude" <theoutlaw_torn@hotmail.com>]

My water is naturally about 20ppm general hardness. 30 microsiemens and 
around PH 7.

However I cant keep it below Ph6.5 .
If I use peat it brings it to that PH and just keeps it at 6.5
That is fine for the apistos I have now... However I would like to try 
keeping some of the blackwater species and I dont know how to keep my PH 
down.
Even in a tank with just water, I use a HCL to bring the ph to maybe even as 
low as 3.8 and it just starts climbing. in a week it will be at 6.  IT goes 
even faster when I have sand or gravel and plants in a tank. the ph starts 
rising within the hour.
How can I keep my PH low for some of the apistos I would like to keep.

thanks
coby


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