I am aerating with the cover off and all jets on full. Following waterbears comment,I failed to bring the ph up to 7.6 before starting. I took the ph down from 7.3 to 7.0, testing before and after, and then began the aerating process. Even with skipping aerating at first to bring ph to 7.6, I still don’t understand why I can’t get the ph to rise from 7.0.