moving a tank and fish

[robzilla]

hi, with the possible acquistion of a 90gal tank, i need to move the tank and it's fish to my home.
what are some of your experiences....
i'll be moving a 5-6" picasso trigger and one large crab. these are the only ones in the tank.
i'll try to save as much water as possible, but it will be tough to save all 90 gallons,
with empting the water, the sand could be left in? after resetting it back up at my house, what's the time frame to put the fish back in?
i'm shooting to save around 30 gallons of water and then putting in new water.
any ideas, experiences would be appreciated.

thanks