First time scorp owner planning on getting an Emperor or Giant Asian Forest . I'm getting really interested in bioactive vivarium habitats and after researching substrate I stumbled upon Biodude's Terra Aranea which seems pretty well reviewed. It says in the description that no drainage layer is needed when using it. Somehow it seems safer to me to include a few inches of drainage layer separated by a screen to more easily control the humidity and water table by siphoning out water, draining,etc. Although excluding the drainage layer would give the scorpion more depth for digging....Would love to get some opinions. Should I include a drainage layer to be safe?