I was wondering can someone give me some insight on the effects of high kh. I should have tested kh , I may have tested for gh & I figured I was ok. I now have a kh of 8 or 9! I cannot lower it. Should I try to lower the ph with buffers? . I have never used buffers before.. I am extremely disappointed in the pool filter sand. My substrate is mostly Flourite I added some pool filter sand to help anchor my plants since I am running RMTS. It helped in that regard. What are the problems I may run into , say high ph fish scratching & do some plants not enjoy high kh? I am use to having total control of my water that I make using R/O water that I remineralize. Without a digital ph meter I really do not know how high my ph is. I do understand that fish get use to ph changes but if they are kept outside their ideal range maybe that could be a problem.