Can you mod the tank to do away with the overflow toward the center of the room, and just leave the overflow that would be closest to the wall? Some glass and lots of silicone would fill the drilled holes on bottom, and a sharpe razor blade would take care of the overflow it's self.
One overflow would not detract from the look or interrupt the viewing space all that much.
One overflow would not detract from the look or interrupt the viewing space all that much.