I cut a piece of triply wood the same size of the back of the tank, and stick the background to it with double sided tape, and than press it against the tank and the wall with some jublo so it will not move. Like that you will not have any sticking tape to your tank and the background will stay flat against the glassMartinBoy;5007980; said:can anyone tell me what I can use to put new backgound film on my 135 gallon without buying that liquid they sale at LFS?