Tank move and sandbed??

[Vagabond]

Hi everyone, been out of the loop for awhile....extended travels then a move into new digs.

Just moved the last of the tank over to the new place and in the process of setting it up as I write this. I had a 2 - 3" sandbed which is currently sitting in a bucket and am asking for opinions on whether I should a) rinse the whole thing and start it from scratch b) Just return it as is to the tank or c) rinse most of it and save a small amount to seed the rest. The sand has been in the bucket for 2 days now.

The tank has been running for 2yrs and is a 65 gal with a 33 gal sump.

I have all of my live rock (70 lbs) split between a rubbermaid container and a 20gal that is currently housing all of my fish corals etc....

Also how much old tank water vs new tank water?

TIA everyone