Your ORP graph looks the same as mine every time I recalibrate the probe. It seems that ORP probes take quite a while to stabilize after calibration, so I doubt that your actual ORP is rising like that...it is just the probe.
Can you alter the scale of your pH graph so that you can better see the fluctuations? I'm thinking a scale of between 7.0 and 9.0...or 7.5 to 9.0. The Aquatronica graph function can do that, but won't hold the setting so you need to reset the scale every time...very annoying.
OK, I give up....what is % Pods measuring?
...and don't hold your breath for a Ca/Alk probe!
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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