I checked it later that day and it was up to 5.9. I am writing off the decrease to ph checker inaccuracy. How often do most people calibrate their ph checker?
The res level is down, but the ppm are staying around 1450-1500(tap is 240 to start) so I am going to hold off topping until this week, or maybe just mix a new batch on Thurs or Fri since the current one is almost a week old.
I am going to continue this thread in a grow journal. More appropriate than in design section.