I have very soft water and for last couple of years was adding Seachem Alkali Buffer. I did it to prevent ph Fluctuation. Sometimes I observed algae here and there. Then I found that less KH buffer I add, less algae I get. Slowly I stopped adding KH buffer. KH of my city water is: 0.5, GH- 0.5. I still add Gh buffer Seachem Equilibrium to condition my tank to GH-3. My question to Tom: Why do we need to add KH? I did not find any stress in my fish by not adding KH buffer. My ph fluctuates from 6.4 at night(Co2 inj. OFF) to 5.8 when Co2 inj. is on. Additions of KH in my opinion causing KH fluctuation and algae.Tom I think this forum is awaiting for your new article.