LOL... of course a CO2 system will alter pH. I do believe our friend here is new at fish keeping so asking him/her to buy a $400 automated CO2 system to control pH is really throwing him/her in the deep deep end.

Don't get me wrong, ur suggestion works. Hell, I know it works, I run a CO2 planted tank as well.

I think he/she is asking for the basics.

Of course, if you wanna know more about CO2 systems, fire away..... :P