A local place stocks this substrate
''Arcadia Reptile EarthMix Arid is a potent and eco-friendly, Bio-Active ready planting medium. It has been specifically formulated by the world’s leading reptile care and plant growth experts and contains organic compounds and worm manure to be easily assessable for plants of arid origin''
How much substrate will I need for a 4x2x2 foot Viv? They do a 10L bag