Irma, your biggest potential problem would be the sand. The fist should be ok in a holding tank(s) as long as you keep the parameters the same (salinity, temp, etc.) and the live rock will be fine in holding tubs indefinitely if you put a powerhead in there to circulate the saltwater.

But reusing the sand has potential for big problems because disturbing the sandbed releases pockets of detritus, nitrates, bacteria that have been trapped there for a long time. You can buy new sand and rinse it thoroughly and put it in there or you can rinse, rinse, rinse and rinse some more the sand you have taken out of there or do some combination of the two. Also, you can always ask someone around here for a couple of cups of their sand to "seed" your clean sand with to add biodiversity and it will become live sand in no time. Especially because you have the benefit of the live rock that will have all the good bacteria in it. Do some research on reusing a sand bed and make the decision you feel most comfortable with, but for the least risk to your system, I'd caution you to be conservative about reusing the sandbed.