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The temp probe can be calibrated (there's a setting you can use to adjust the temp up or down to match "actual", at least on the ACII).
I'm actually hoping that cleaning it helps some. It's a little gunky right now. ::)
Went downstairs last night to check the tanks and found the PH between 2.8 and 3.2! Logic kept telling us that the PH could NOT have been 3. The fish were still swimming, corals had PE, LPS were fat and healthy.
In spite of the tank looking fine given the PH reading, it took everything we had...
Possible that you had some sort of "air lock" to cause the overflows not to kick in right away? Our stock tank & fuge always go through that when the system starts back up (but we know and expect it).