The cool side of the cage is at around 75 degrees, and the warm side is probably 85 or so. I use an undercage heat source for the warm area, and a heat lamp on a thermostat to ensure that the cool side doesn't get too cool. I use aspen chips in the cage since he likes to bury himself.

I heard the sound once about two weeks ago, but didn't have him out much since then. It wasn't until sunday night that I had him out long enough to notice his breathing noise.

Can anyone recommend a good reptile vet in the Maryland-Washington, DC area?