Along the vertical lines, place the first bonsai tree in a forest or create a border with a group of tall aquarium plants.
In aquascaping, we can do this as well. For example, a foreground plant, like Dwarf Baby Tears in the photo above, can span the bottom 1/3 horizontal line of the tank. Along the vertical lines, place the first bonsai tree in a forest or create a border with a group of tall aquarium plants.