What substrate do most of you guys use for your kings? I rescued a desert striped king and of course the guy that had him was using Aspen. I know aspen is common due to them likeing to borrow.. I have always used Eco Earth for my pythons though...have yall any history of eco earth with kings?

Reason I ask...i'm thinking of feeding him in his habitat for a while until he get a little more used to an owner that will actually show him some attention. He takes a while to get out of his feed mode and its a battle not getting struck on (though his aim is terrible!)