Ozdude wrote:

You really need the tank cycled completely and plants and fish in it before
you start with the CO2.


Set up an aquarium with enough quick growing plants, light and CO2, and
the tank will even skip the cycling process altogether because the
plants will consume the preferred ammonia directly.

http://www.csd.net/~cgadd/aqua/art_plant_newtank.htm

Nikki