I have switched salts several times and have never really done anything special. I do 30gal change to 110 total water volume. Can't see any reason why with just a 30 gal water change on a system your size that you would have to do anything special. I do know that when I used IORC that it took it a while to totally dissolve, not sure how long you wait after mixing to do the change, but I would watch that.