I used to use aspen but it made it too hot and dry and got a funny scent after misting it a few times. I use cypress and eco earth and I'm much happier with the natural appearance and how well it holds humidity. Also Louie cam burrow in it which be likes to do!! I just take him our in feed night and he has no problem going from viv to tub and then after he swallows his food, I replace him into his home!! 10/10 do recommend xx