7 days ago pH was 8.7, 4 days ago 7.5, yesterday 6.5 then 7.3 after I increased food rate and added 5 gal of RO'd water at 7.6 pH. That's right, RO system is up and running, churns out 5 gph removes tds but only slightly decreases pH. Power outage early this am for 3 hours due to storm, generator running, no casualties.