Hi All, Finally I got today the master test LAB mad by Red Sea (Anyone knows?) I was mostly interested in the KH in order to find out the CO2 concentration in the water. Although the results really made me sad Fish and plants seems happy.... here goes: PH 6.8~6.9 KH 9~10 GH 12~13 CO2 in ppm according to the CO2 test is 18 PPM Ammonia, Nitrite and Chlorine are all 0 (at least these are good) Despite the fact that the water are very hard I am kind of confused regarding the CO2 levels. According to some CO2 tables levels are HIGH 33.991 ppm Should I reduce my CO2 levels ? I know that plants can do well in hard water, but I guess I can use more RO water ? 10x 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/