I would try it. I think that you are talking about coco-earth? Or compressed peat bricks? If so, this is basically what we use to keep earthworms in. So they might do well. If they don't, they will become fertilizer, and everything will be ok so long as they don't stink the place up. Now the problem might be an introduction of disease via the earthworm to your animals, I've been warned about this in the past. Are you willing to risk it? Make sure you get them from a pesticide free area as well.
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"Kings made tombs more splendid then the houses of the living. And counted the old names of their descent dearer than the names of their sons."
-J.R.R. Tolkien
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