The backdrop can now be positioned. This is best fitted to the outside of the tank as it is easier to change if you so desire. If the backdrop is to be fixed inside the aquarium allow sufficient time for adhesives to cure before continuing to install other internal decor.

The backdrop shown is made from cork tiles stuck to a thin board. I used the same clips which are used on frameless pictures (the ones that just have a glass font) to hang the board from the top of the tank