well, yeah actually you can.... your better off using the following substrates though. Brown Rice Flower Coarse Grade Vermiculite Fine Grade Vermiculite Perlite Popcorn Crushed Oyster Shell Shredded Wheat Straw Rye Grain Berries Rye Grass Seed Hydrated Lime
Ive always like Birdseed. All the diffferent sized grains absorb different amounts of water and helps to balance the water content of the grain over all better. It is also dirt cheap.