Hi, I have a 30 gallon tank with a 5 LB bottle of CO2. I run it 24/7 at slightly over 1 bubble/second. The tank lasts an average of 8 months, keeping my pH at 6.8, with a KH of 5. Frank --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html --- ------------------ To unsubscribe from this list, please send mail to majordomo@thekrib.com with "Unsubscribe aga-member" in the body of the message. Archives of this list can be found at http://lists.thekrib.com/aga-member/