My baby black milk snake arrived this morning, about 40 min ago

. He was pretty freaked out so I couldn't hold him for pictures but here are a couple quick ones:
After that I wanted to leave him alone so he could settle in

. I'll get some real photos once he's settled. What do you guys use for substrate? I was thinking of doing aspen but let me know if there's something better. I'm still planning his "real" set-up

.