Few weeks ago my lfs tested my mag and I was at 1320. Today they tested it and it's at 2800!!?? I haven't dosed and the only thing from last test to this test was a 5 gallon water change and a weekly dose of Kent's iodide. One other thing I did was use the magnet to clean brown crap and algea off the back of the glass that was never done. Tank is 3 months old. Alk is 7 and calcium is 440 along with a ph of 7.8. I just dosed Auquavitro 8.4 to bring up ph and alk. Let me know your thoughts. Corals are all thriving.