PLEASE HELP: Cloudy Eyes, Maroon Fish No Longer Swimming

Right now I have two maroon clown fish on the verge of dying. I had lost everything in my tank, including snails/cleanup crew. I also found my two damsels dead. The only thing I can notice on the two surviving clown fish is that their eyes are cloudy.



I am making fresh rodi water for a FW dip but I'm not sure how to do that (how long etc.) and Im not sure if thats what I need do.



PLEASE HELP I DO NOT WANT TO LOSE EVERYTHING TODAY!



Thanks!