My tank has tons of sps in it. I do believe my probe is working correctly i am trying to understand the readings and what they mean is all. My DT is 240 gallons and my sump is another 200 when i do a water change i change 60 gallons. I will try cleaning the probe really good and wait a couple of weeks and see what i get for readings. They say to recalibrate the probe once a month but that it take two weeks to get a actual reading so the probe is only giving you a good reading for two weeks. I just want to understand it all.
Keith
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