So I went to my 20 gallon tank and noticed that my zoanthids were not doing so well. I tested the water and everything was great. I then tested the salinity and it was an unbelievable 1.035. I immediately rushed all of my corals to my other tank and begun a water change. I finally got it down to 1.024 but some of my corals, such as my utter chaos and eagle eyes are nearly dead. I tried an iodine treatment but it did not work out. Overall, it wasn't huge, I lost some money from the corals that died, but at least it wasn't all of the corals.