Another vote for a piece of 3/4" plywood. I moved my 55 last year and this is exactly what I did. Find a way to have the ply be level with your tank, perhaps on a table. One person on each end, try to slide it onto the ply without causing too much friction and, if you have to, lifting from say 1/3 in from each end. Carry and repeat on the other side.
You will be fine. Its VERY stressful moving a tank, you worry about it for days, weeks, months before doing it. Just prepare and have some good friends with you and it will work out.