I have two full grown ackies that live apart (they hate each other, go figure), and due to a recent cage shuffle, one has been moved to a more spacious Vision cage. The one drawback is that you can't have a deep dirt substrate for Visions because of the low litter dam. I'm looking to sell this ackie, so what can I use as a substrate on a temporary basis that won't stop up the tracks that the glass doors slide on?

