I have had to move my 180l tank a couple of times now. Twice now to decorate behind, once for major tank refit/clean/convert to planted and shortest stay move for 2 days when wooden floor was fitted.
I siphoned water into large flexi buckets
http://www.wickes.co.uk/invt/160179, use yellow bucket you can then see what is in them, put fish, heater, plastic weed and air stone in as temporary home. They stayed in one of these from a Friday night to Sunday afternoon when I converted tank to planted. Cover the bucket stop attempted jumpers !!!
Drain rest of water into further buckets, if you intend to reuse the water.
I got the tank to about 1-2" deep and my wife and I were able to lift/carry the tank (still heavy) to a table with sheet of wooden board on to act as support. Easy to move stand then. Lifted tank back onto stand, added water back in, added fish back in job done.
For moving when we had solid wooden floor fitted replacing carpet, I only drained 1/2 the tank. One of the floor fitters and I managed to lift/drag the tank & stand to middle of room. We then cut the carpet around the tank, leaving a run of carpet back to the wall, which we rolled up behind the tank. They then fitted the solid wooden floor, where the tank would be, left day or two for glue to dry, unrolled the strip of carpet, which now acted as a floor protector as we lifted/dragged tank back and by lift and pulling got carpet out from under the tank. Job done.