Potting Soil in vivarium substrate

[melon014]

I've been looking for potting soil to mix in my substrate. I've done a lot of looking around and no one seems to be able to recommend a brand name or specific kind. It's for a toad vivarium so, I know it's not supposed to have vermiculite or perlite. Obviously no fertilizer. I tried straight top soil from Ace Hardware, but it was too clumped together.
I found this at Earl May, the lady there said the only thing she thought might be a problem is the nitrogen. I was also wondering about the poultry litter. Other than that it looks okay, I think.
What do you guys think?

[melon014]

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