Advice on moving 20 gal tank from one wall to another 8 feet away

[Reefer1485]

The move was a success!!!! All coral and fish are acting like nothing ever happened. I took out 2 gals to throw away for fresh water then I took out 8 gals and moved it. Gonna let it sit over night and then do another 2 gal water change. Will check parameters after water change and then get it back in balance. Feed the fish coral this morning so will not feed the fish again until tomorrow. Also I would like to black out one side of the tank that is getting a little indirect sunlight, what would be some good material to put on the glass film wise.
Thanks