personally, I wouldn't add the old filter pad and bio-wheel unless it stays in this tank. adding the filter pad and bio-wheel and taking it out later is the same as adding 20lbs of LR
into your tank to cycle and taking it out. You want all of the bacteria on the LR
in your DT and not take it out after the cycle.
My wording is kinda sloppy, if you dont understand it, ill try to explain better xD