First ground up build 46 gallon bowfront

Ok so can i use 60-70lbs(whatever it takes for 2-3") of freshly washed sand from another tank that never even had fish in it? and just use all my Liverock 60lbs or so, assuming it was immediately transferred without having a cycle? Should i seed the sand with a cup from the current tanks?
 
I was gonna put down all the new sand then on the top put the "seasoned" sand from another thank like a cup or 2???
 
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