My Partner is looking to put mulch in the garden and we thought maybe we could double pupose it as Feed/ Bedding for our pet rat (and guinea pigs). Looking at Sugar cane straw, Pea straw and Lucerene Straw Mulches. But can't find any info on whether or not they're safe for rats. If none are, then we're gonna try Chaff, but if we can double purpose straw mulch, that would be awesome.