1. John P Coates

    KH Stability

    Hi Folks, In my tropical planted tank (including fish), I use RO water to which I add Tropic Marin Re-Mineral Tropic salts. I also add sodium bicarbonate to bring the KH and GH to 5°dH and 7°dH, respectively. In as little as 9 days, the KH has increased to 6.5°dH. When KH = 6.5°dH, pH varies...