Need a little assistance interpreting current pH. Started on 6/18 around 7.8, 7/5 was 8.0, and today it's somewhere in-between the high and low range. *40B currently in the middle of a fishless cycle, temp around 82*F or so. Thought pH went up because I added more zebra rocks, but now it's lower. I have hard water out of the well, last I checked tap was around 7.8 pH.