Acroholic;925285 wrote: Typically, you would have a full sheet of glass on what is considered the the "front" of the tank, with the side glass edges butting up against and behind it it, which looks the best. Seen that way, the Deep Blue overflow would be correctly situated in the back left corner.
But in all practicality, you can have the overflow in the back left or right if you don't mind seeing the siliconed edges of what would become your front pane of glass with the overflow on the back right.