My original reason for posting was that I'm thinking of setting up a 20 gallon tank. I like to use co2, but don't want to spend the money to set up a pressurized system for a small tank. I was concerned about the level and stability of co2 in a diy co2 setup which I was thinking about. Would the addition of excel in a tank with low levels of co2 help to stabilize the system ?

Henry