What kind of bedding should I use for chinchillas?

I know I should not use Cedar or Pine and most of that kind of bedding, but I know the best would be a recycled bedding like Carefresh, but if I dont use that can I use fleece? One more thing I am making my own cage is it ok if instead of using wood on the bottom of the cage cage i use chloroplast like a C&C cage?... show more I know I should not use Cedar or Pine and most of that kind of bedding, but I know the best would be a recycled bedding like Carefresh, but if I dont use that can I use fleece?
One more thing I am making my own cage is it ok if instead of using wood on the bottom of the cage cage i use chloroplast like a C&C cage? If they are able to chew through it, I will tuck it behind the chloroplast so they cant chew on it.
Thanks
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