Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
A 12 long is not much volume.
Remove the heavy things (water, stone). Put the fish in a separate container, and make sure the equipment is properly packaged. For a short move the filter can simply be moved as is, but for a longer move the bacteria are going to need more oxygen. Put the media in a bucket with just a little water for humidity.
Put the tank on a sheet of plywood that is a bit larger than the tank.
Have 2 people lift and carry it by the plywood.