Thanks, Jean! Really good suggestions. I took the shavings out yesterday entirely and put down just paper towels (several layers so it's cushy) just in case the one that died ate some of the shavings. They're eating really well right now, including about 6 stupid moths who thought fluttering around the heat lamp was a good plan, and a couple of legs from a beetle that my enthusiastic son gave them during the feeding frenzy. I found some sandy dirt outside and gave it to them for the moths, and I'll be getting some playground sand today for grit.
They've got lots of space to move away from the heat lamp, but right now they tend to sleep loosely gathered under it since I raised it up a few inches. When they're awake, they run all over the place. I've been watching their behavior more than the temperature over the last couple of days in trying to decide if the temp's right. Right now the temp says 83.1, but they're not huddling under it or clustering together, so even though the numbers are low their behavior makes me think it's the right temp. Does that make sense?
One odd thing--I've got two waterers, one that's a glass jar with a metal base and the other a plastic jar and base. They don't like the plastic one at all! This morning when I woke up, the metal one was almost completely empty but the plastic one looked untouched. Odd, huh? Wonder why they don't like it... maybe they don't care for red? I also tried giving them some crumbled hard-boiled egg yolk last night and they were so very not impressed. Maybe they were just full on moths.
And the little "flip bar" on the top of my feeder that's supposed to keep them from getting on there? They roost on it. Snicker. Guess that doesn't work as planned.