Hello All, I have a 100 gallon planted tank. Since I was adding to much of a CO2 with a PH of 6.2 and KH about 10 (40-45ppm) I have decreased the CO2 amount from bubble per second to bubble per 5 seconds. Water parameters are as follows : PH 7.2 KH 10 GH 12 That leaves us with a CO2 at about 19ppm - Optimal! based on the Chuck CO2 table. Ammonia, Nitrite and Chlorine are 0 The CO2 cylinder is a 500 grams so I guess it can suffice for the long run as I do not use much of it. I carry out water changes every 14 days about 1/4 of the tank water and the fish load is also not to big 12 Cardinal Tetra 3 Flying fox 1 Discuss 2 Small guppies and 2 platies 20 Amano Shrimp If I won't use the CO2, My tap water already comes with PH of 7.2 and KH of 10 - does this eliminated my need for a CO2 system ??? Do plants do better in a KH between 3-8 ? Thanks Amit --- 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/