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This works very well, thin layer of vasaline and press firmly onto the glass from the middle outwards (to prevent trapped air bubbles) then fix it with tape.Metermaid said:Picture backgrounds are normally placed on the outside of the tank - usually you get a better effect if there is a 'sea' between the background and the tank glass - after numerous tries I have found that a thin layer of vaseline works well ! then I just use sellotape to secure the edges.
Good luck
Rita