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The substrate in that picture is alfalfa pellets. This is actually where I got the idea to make Magellan's enclosure. The only things I recommend if you choose to go this route (which isn't as bad as it seems) is to make sure you have easy access to the UVB light because when it comes time to change it out, you will have to remove the doors in order to get it out especially if it runs the length of the enclosure. I also advise that you make the background removable and the tiles not sealed in or at the very least just silicone the cracks.