Moving a 120 gallon reef about 10 feet

[Locke]

I'm moving a 120 gallon reef with a 30 gallon sump from one wall to another after the missus decided it wasn't in the right spot. I have 4 fish and really no corals at this point.

My plan is to drain the entire tank into 5 20g garbage cans and make up the rest with new water.

My question is two-fold, should i take a few cup fulls of sand and rinse the rest? or just leave the sand in the bottom of the tank and move the tank to the new location?

Is there a better way than using a whole bunch of garbage cans?