+1 to Rychek's comments. I don't know what Parm means but when I upgraded I used all of my old water. I had planned on using only 50 gallons of the old tank but seriously misjudged how much three hundred gallons is.

I used all of my old water and used the the old water to transfer the corals and fish from one room to the other. Didn't add any other rock, but added a new sand bed and I am now paying the price with a nice cyano bloom.