I have the same size tank, a large/wide exoterra, came with a painted Styrofoam background that looks fine despite some foam grains if you look close, and it can get scuffed easy, OK for snakes, not so good for Lizards or critters with claws. I've seen people hot glue pieces of cork bark or tiles for a more natural look, painted resin backgrounds can look awesome, but are pricey, just google "3D terrarium background" and there are a lot that come up. This is my setup, beats a simple poster behind the tank, helps insulate, good for attatching decorations and running thermostat/temp probes through, and my snake likes to climb on it.
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