The Arcadia mix looks awesome, but I bet you could get by with a home brewed mix without too much trouble. For a corn you might not need a drainage layer, but I don't think it's necessarily a bad idea to have, especially if you're wanting to use live plants. I used lava rock for mine, though mine is a paludarium and has a layer of Matala filter pad underneath that. Organic potting soil would likely be ideal, and you could mix in a little play sand and maybe coir? You can even add some azomite powder to increase the mineral content of the soil for any plants you want to add, just be sure to use a mask when working with it dry.
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