first off, your kh is fine. you do not need to reduce your kh, especially
since you are going to use co2.

2nd, what kind of ph buffer are you currently using? Your ph is too low to
be natural with that kh. you will not be able to use co2 charts until you
get that additional buffering out of the system.

--

Margolis
http://web.archive.org/web/200302152...qs/AGQ2FAQ.htm
http://www.unrealtower.org/faq