When I got the rocky sheet for my 5 foot 120 it came with magnets to hold in place not clips. It will most likely be dirty and will need to be washed with a brush and plain water. I did mine in the tub as it was winter , talk about a ring around the tub. Not that bad to install, remove 50% of the water, decorations,heaters,filters and air lines. Then remove the substrate from the back glass, and cut the background to fit inside, I subtracted a 1/4" all around so it would clear the silicone in the corners. Then fold the background in half length wise with the decorative side facing it's self. Start at the top and slide down the back glass into place. Now the tricky part is keeping the fish out of the way, I keep African Cichlids and they can be quite curious and are not hand shy. This is what worked for me but someone else might have a better method that would work better.
