I just recalibrated my refractometer. Tested the salinity of my tank and it is 1.022. This explains a lot. Considering the struggles I’ve been having. My tank is almost a year old. Surprising my corals are doing well but I have killed a lot. I’ve been struggling w my parameters and this is def the answer to my problems I believe. Should I do a water change and correct it in one go or slowing bring it up over several weeks. Thanks