How do I attach the background to my fishtank?

Answers:
You tape it on the back wall of your fishtank.

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Hello...on the outside..in the back with tape along the edges ..unless they are self sticking or like the magnetic photo type backgrounds, then you have to just make sure the glass is very clean first...Take Care :)

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i think you just tape it

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Attach it from the outside with a little scotch tape.

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tape it to the outside of the tank

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Its in the back of the fish tank. You will need plenty of tape it falls off easily
good luck~~~!

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Use Vaseline. If you tape it, it won't show p very well through the glass. If you put a VERY thin coat of petroleum jelly on the outside of the glass, it will be vibrant and beautiful!!! It will hold it on too.