Vivarium Backgrounds

as above really, because "I want to stick it on an artificial bottom in the back of my vivarium. What would be the best thing to use? PRIT stick before I tried but he kept taking off!

It depends if you talk about one of the polystyrene one.For photo or photos to paste on the outside with tape.

For polystyrene (3D) environments is the best way to push against the inner wall of the tank (or turn around the barrel so that the back becomes down) and use aquarium sealant sillicon use around the edges. Leave to dry for 48 hours without animals inside. Do not try to use other types of glue or sealant (including sealing sillicon normal) that many of these are toxic to reptiles.

ok well it sick outside of the tank were your custom reptile or remove anything then use blue tack or tape it should work, otherwise you need a new background artificial
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Pay attention to the background. Your reptile basking light color may disappear. Try to get artificial plants inside the vivivarium place.