Not sure why you've posted these questions in the Reptiles forum, but I'm sure someone will move them for you!
IMO you'd be better off with a bunch of freindly fish-geeks than some random house-moving guys that haven't got a clue about fish. Here's how I moved my 4' tank about six months ago.
* Turn everything off. Undo plumbing for sump, remove heaters etc. Get tank ready to be moved.
* Remove all driftwood and rocks. Use hose to syphon the sand into a bucket.
* Fill large plastic bins for the [big] fish. Drain the tank to half, keeping the water in plastic buckets (with lids).
* Catch fish.
* Fill as many buckets as possible (took about 70% of the water)
* Chuck it all in the back of the truck, drive across town.
* Set tank up, add all the old water and substrate.
* Add fish and give them a minute or two to calm down.
* Top up with tap water, adding stress coat and salt to help with any wounds.
Try to keep at least 50% of the water, but if you don't its not critical, just keep an eye on things as you might get a mini cycle.