Making a nocturnal, underground paludarium was not the plan when I set out to build a DIY fish tank rack. After carving foam into the shape of a shallow cavern with a waterfall and wild moss, I knew exactly what tropical species would be right at home inside. I never expected the aquarium section would lend itself to amphibious life, but after a year of careful adjustments it has become an (almost) self-sustaining oasis.

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