A lot of care sheets recommend cypress mulch as a substrate, as it doesn't really mold and keeps excellent humidity. I picked some up from the local garden store just to test it out. After washing and baking it, I'm still skeptical. Is has a lot of dust/dirt/sliver like pieces in it. I also wonder about it giving slivers, I know I wouldn't want to live on it. Anyone have some thoughts/suggestions for using it?