06-27-2013, 12:55 PM
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You can definitely give it a shot and see how it works. If you feel like seriously moving onto CO2 watch craigslist for a cheap used CO2 tank/reg. These are often used by home brewers (kegerators) and can be sold quite cheaply compared to an aquarium system, sometimes hydroponic ones show up too. You would have to replace the output on the regulator with a hose barb for aquarium CO2 line but thats not that difficult. You would also need a inline bubble counter, needle valve, and check valve but you can get those reasonably cheap off ebay.
Typically CO2 is suggested when you are running 2WPG or higher of HO T5s or similar high intensity lights along with heavy daily fertilizing. Just don't be surprised if you don't see too much of an boost from your yeast system. A standard system requires very little care compared to a yeast system. Only refilling of the tank every 3+ months depending on the size. CO2 is usually pushed more towards plant propagation or very high light red plants. I've been using a system for about 5 years now and certainly would not call them a waste as long as the lighting and fertilizers are high enough to require it.