My experience if you add sand with live rock you will have alot of sie off and very hard to clean up. If you add sand after like the sample i said it will benefit your tank in the long run..
I did 2 tanks my friend 2..
First take No sand at all bare bottom, Pods
where little present.. Nitrates <5 ppm
Second Take Mine Sand didnt do PVC
trick, Nitrates constant 20ppm, added sand and live rock at same time..
Friends take which im doing soon..
1st tank he did he messed up big time, lOL
2nd tank PVC
Trick, Added sand after cycle his sand looks real clean, Ton of Life, Nitrates 0ppm, so I guess this works..