07-19-2008, 12:46 AM
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You can also use an air pump with an airstone in your tank to bleed off excess co2. Some people run them for a few hours at night on a timer. The only time I've been concerned about too much co2 in the tank is during the first 24 to 48 hours of adding the yeast to the mixture. This is the time when the yeast is the most active. So to bring the levels down a tad I have turned on the airstone for a few hours at night. Just be careful about messing with the co2 levels too much, as large changes in co2 can cause large PH swings which might affect any fish you have (if any). After 48 hrs the flow of co2 becomes rather stable for about two weeks.
If you find that after 48 hrs the co2 is still bubbling in too fast then make a mixture with less yeast. Less yeast = less co2 production. One bubble every 3-4 seconds seems like a good start point. It will take some experimenting to find the right receipe for your tank.
But what ever you do, NEVER EVER restrict or shut off the outlet tube of your DIY co2 generator! KABOOM! A blow off device is a good idea, but again, it will take some experimenting to find the right blow off pressure.