Doesn't like Kool-Aid
Join Date: Feb 2003
Location: Hawthorne, New Jersey
I would really think about it.
It would be very easy to crash the pH on such a small aquarium. It wouldn't take much. I'd make sure the KH wasn't too low to begin with, and then watch the aquarium like a hawk.
I would also consider the size of the equipment in relationship to the aquarium. How are you going to get the CO2 in the aquarium? How big is the diffuser or whatever you plan on using? Is it going to be too big and take up too much space?
A 6G is so small you could get away with dosing Excel and save the hassle and space.
All that being said, most importantly, I'd look at the water parameters (KH) and let that be the guiding factor.