As a newbie bp momma, I can tell ya... Listen to these guys... They know their stuff.
I've run across one thing with substrate however, I feel you should weigh in the humidity while picking an appropriate one. Aspen will suck the moisture out of the environment and make humidity control quite difficult. I live in the desert where of course, it's dry as heck and recently did a complete tank changeover in order to combat this problem. Seems to be helping but we shall see.
Quick ? Guys <and i wouldn't do this here but i think it will help the OP as well as he learns> I switched to reptibark, along with doing the foil/tape thing on the top and also covered the sides and back with that black squishy cloth like shelf liner. This morning, ambient humidity is showing 44%, but that is measured about 3 inches off the floor. At floor lvl it is at 73 <and dropping over time since the bark is brand new>. Which reading is more important? And how long can she take that high humidity without scale rot becoming even a remote possibility? My instinct tells me floor lvl as that is where my bouncing baby ball lives but am unsure enough to ask. Oh and that is on the cool side, I'm picking up another acurite with a probe this morning as my dumb arse accidentally grabbed one without the probe and that one will be hot side only. Safe to assume its actually higher on that side.