I like breeding newspapers, sometimes the offspring come out as a nice mix between the comics and the entertainment sections. I have a really nice local het. sports that I produced last year.
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I voted aspen, I used to like coco-husk but I moved to aspen recently just because of the availability. I get 8 cubic feet for $15.00, as opposed to a third of the size of cocohusk. That and I use Aspen for my rats too. Its just easier.
Cheers.