Im building a 4'x2'x2' wooden Vivarium for leopard geckos. Going to use a soil/sand 50/50 mixture for substrate, grout to paint and keep the substrate attached to the styrofoam. The inserts are made of styrofoam as a base, and great stuff expanding foam as the outer layer for carving. Going to be adding live plants, and heat cords/pads to heat the caves, with a heat lamp over head.









