I think a vast majority of people use Aspen.
But your humidity at '0'???
I find that impossible... either your hygrometer is broken or you're using a stick-on.
Mist the aspen once a day.
Some days I don't even have to do that to keep the humidity up. Cover the lid, and you should be okay. I don't see how your humidity could possibly be 0 unless the room you're in has a de-humidifier set to high.