Can I place loose substrate in the habitat?

Yes! All of our enclosures come with a substrate shield to keep loose substrate inside the enclosure. Our 2 foot (24") tall enclosures come with a 6" optional substrate shield. Our 4 foot (48") tall enclosures have a built-in 12" substrate shield. Enclosures with built in substrate shields also include a screen panel that can be used instead of the acrylic substrate shield. 

Zen Habitats 4x2x2 Reptile enclosure corner