Reason I thought you needed more was the reference to "Live" sand. Don't waste your money pls. Nothing can live in a sealed bag on a store shelf. Dry, aragonite sand will do just fine and is MUCH cheaper.
Also, consider this. Fill the tank 1/2 way with water. Add the recommended salt for the full tank, minus 20% maybe for rock displacing the water. What I'm saying here is that a 75g tank will not hold 70 gallons of water when rock and sand is used. Turn on a powerhead to mix the salt. It can a couple hrs to make the hard salt dissappear. While rinsing the heck out of the dry sand for a good while to get most of the dry dust out of it, add the rocks and landscape them to your liking. Feel free to stack against the back wall. Keep it 2" from the side walls to clean better there. It will get ugly later. Add the sand. I like 2-3". You don't want rocks sitting on top of the sand only.
Anyway, that worked for me.
Finish off with SW
mixed to bring you to your target salinity level. By a refractometer.