brendan
Aquarium Advice Activist
Here's a pic of how to set up a reator which is super cheap. Having the bubbles enter the tube and travel up against the down flow of water from the power head really difuses them. Keep in mind that the more C02 you have in your tank the lower or more acidic your water is going to be. Check out this link for recommended levels of C02
http://www.csd.net/~cgadd/aqua/art_plant_co2chart.htm
HTH
http://www.csd.net/~cgadd/aqua/art_plant_co2chart.htm
HTH