I don't think is a watse of mix salt water because nsw water may got problem and if u do 80% change water 1 time u will loss all your cycle water then u have to cycle again if I not wrong and if your tank is 322 or bigger 80% change is a lot very hard for u to mix the slat outside tank for me I use mix salt when cycle finish I change 20% and add reactor then weeky change 10% until no3 reach 10 I add fish and coral to test the water this way for me I think is safe and eazy hope this can help u
Sent from my iPhone using Tapatalk