Normally 7x2, 2 people one lifts each side of the tank off the stand onto milk crates ( these babes can hold a tank easy trust me I put my 8x4x3 on 2 of them coming off a trailer and it held for a good hour lol ) then just move the stand.
I dont know 7x2s are not heavy? other option would be to try a LFS see if they have suction cups may make it easier for you.
furniture dollies work well also, I prefer lifting the tank as placing the tank so low on the floor is a nightmare for me but if you can find one cheap/borrow they make ones that jack up to x height these are the best, just remember to keep wood under the tank if your placing it on anything metal and bend your knees!!!!!
you can also stack egg crates next to the stand, lets say the tanks 3 egg crates high then you stack 3 high then lift it up get someone to pull 2 egg crates out (1 each side) your left on 2 then repeat again once you get down to 1 you can place the tank on a thick sheet of foam or so (100MM + ) and just slide the tank around.
Moved a 6x2x2.5 by putting it on a single bed frame with wheels and wheeled it around.
your options are endless lol. honestly if you can just lift it that little distance will be the easiest, 7x2 80-100kg come on