Use a PH buffer rather than a heavy alkaline / acid to change the PH. The
buffer is more gentle and depending on the source...a natural product that
appears in nature that balances those environs...Always go for the most
organic solution and chemicals as a last resource.
6.5 is pretty low for most tanks...
You might want to research your fish and determine the need before making
major changes (although you need to do something with that high of a PH -
unless or course you have fish that naturally live at that level...so
actually do. and higher)
Most community tanks do well at 7.0 (neutral).
Plants are also a great way to stabalize all the elements of your tank(s).

Cheers
"Petebert" wrote in message
...
because its high, i dont remember what it was with the high test, i think
7.8-8, i know its too high for the normal test

"Aqua" wrote in message
...
I got one of those pH down bottles, trying to lower the pH in my new
55gallon tank to 6.5, been a pain, the bottle says if you have fish in
the
tank not to lower more then .2 per 24 hours, anyone know if its the
same
for
plants? Im leaning towards yes seeing how theyre alive and all.

Why do you want to lower your pH?
DO NOT use any of those chemical on your tank.

--
Thank You

Dominic
http://www.dlink.org/aqua