That's great to hear. After the test run at midnight last night, it appears to have leveled out. Maybe just needed a "break in" period??? But I will definitely keep that in mind and may just run manual tests this weekend and see where they compare with the Trident and calibrate if need bei recently purchased and setup my trident. I know exactly what you mean . What i did was after the 3rd morning i manually tested everything with Red Sea Test Kit and compared all my results to the Trident. My Calcium was WAYYY high on the trident in the trident as it had been and magnesium was showing a bit low. Alkalinity was showing an entire PPM the it actually was. upon calibration which took about an hour to get the actual numbers on the bottle, i then ran a secondary test on my sump water and all my parameters tested within range fo my manual kit. SO in SHORT CALIBRATE, hope that helps.