Actually the tanks (and bottoms) are the same, but since I need to slide mine out from under that shelf to work on it I have it on a special mat of a high tech material made from recycled wood pulp which reduces the friction with the desktop and cushions the bottom glass.
Yeah - that's a load of crap, I cut a piece of cardboard from the side of a shipping box, that's what's under the tank so I can slide it
For the background I went to the dolalr store and got a mirror that was mounted in a cheap 8x10 frame. Trashed the frame, scotch tape around the mirror edges to avoid getting cut, then taped to the back of the tank - now I have a mirrored back! You could always do black vinyl or craft foam on the back.