Couldnt find anything in a search in past post so I posted again. Sorry. WHat substrates does everyone use? Home-made or commercial? Anyone use that stuff you can get at pet smart call Jungle FLoor or something that is like a mix of soil, sand, vermiculite,etc. I use bed a beast and have been for a while now. I use the brick but have used the pre-expanded bag that doesnt hold water well at all compared to the brick. Thanks.