I just bought a Red Sea Iodine test kit and some iodine. I have never added liquid iodine to my tank before, I just replenish it with weekly water changes. I just tested my iodine and it says its at 0.09 ppm. Why would it be so high? I have not added any iodine! I made a 30% water change 5 days ago. BTW I have a few corals: 1 kenya tree, 1 frogspawn, 3 mushrooms, and a zoa colony.