You can spray paint pexi and attach it to the back. It's easy to remove to see in or for cleaning the glass. Graduating different shades or even backlighting can help add more of an illusion of depth.
Waterproof hockey shinpad tape works great to attach it.
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Brian
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220g inwall 48"x36"x30"
110g mangrove refug/sump
Poison Dart Frog Vivarium
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