I am currently running a 2 liter co2 generator on my 5 gallon planted tank. It seems as if I am always refilling it. I am preseantly in the process of setting up a 20 gallon planted tank. I happen to have some 5 gallon jugs that would be perfect. My question is would more surgar and more water help the cultures to last longer while still producing roughly the same amount of co2?