I couldn't find a direct answer, most searches results are about run off PH. So I mix my nuts and then use PH down to get it to 5.5 to 6 range. I put in the air stone and an hour or 2 later the nuts are 7+. I readjust and again, it raises to 7+. I adjusted before bed and check it in the morning and it's 7+ again! Is it the natural buffering of my tap water? The PPM of my tap is 80, I wouldn't think it would have that much buffering. What to do? I brought it down to 5.5 again and watered with that but why is this happening? Thanks