If your PH is 8 you are OK I found that my fish did not like it when my PH went down to 7.8 or lower I do use kalk KH buffer with mag in it to get extra CA in the tank and to raise the PH to between 8.1 and 8.2. I do not use reef buffer as it has to many things in it from what I've heard. I don't trust a product that does not list he ingredients on the label.

Bill