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Hi all! I'm having an issue with my Milwaulkee #SE220 probe that I'm using with a Milwaukee MC122 pH controller. I use this in my 40G breeder, but I also use the probe to check pH in my other tanks. The 40G is my high tech tank with high LED lights and CO2. I just use my well water in it which naturally has a GH of 5.5 and a KH of 7. Mixed community tank with my Bloody Marys.... They love it and thrive... A month or two ago, I set up a new 11 gallon True Aqua rimless for some *georgous* PRLs I got from TropicalAquarist. I used ADA Amazonia (regular) and cycled it. I'm using Poland Spring Distilled Water that I get from the grocery store. I'll probably get my own RO unit in a month or so. I reconstitute it to a GH of 6 with Salty Shrimp GH+. I leave the KH at zero. The weird thing is, that my pH probe won't read the pH correctly. It reads the pH as being somewhere in the mid 7's (it varies). I didn't believe it, so I broke out an API low pH drop test (not expired). The API test tells me that the pH is at 6.7, which is what I'd expect from DI water and Amazonia soil.... That seems about right.... I called Milwaukee, and they sent me out a new probe. But the new probe does the same thing.... The probes seem to read everything else correctly... It reads my well water correctly (which the API test agrees with) and the calibration fluids at 4 and 7. But it just reads the water in the new tank wacky. Any thoughts? Has anyone ever had a similar issue using either ADA Amazonia soil or Salty Shrimp GH+? Or is Poland Spring just evil water? (LOL) Thought I'd ask around here before calling Milwaukee back. One thing I'll say for them, they have great support, in that they'll send out replacements at the drop of a pin. But I'm thinking that maybe they won't know either..... And a I've already had a replacement...