I have a 55 gallon saltwater tank I am now starting. I started up my powerhead, powerfilter and my protein skimmer. I mixed in my salt after 12 hours however I realised that salt has settled at the bottomof the tank. I tried mixing it by hand but to no avail. I have taken readings using an coralife deep six hydrometer and I am getting different readings between 1.020 and 1.022. Can someone please help me.