Thank you, KMG! Is there a safe way to check for other symptoms? I've read about using the stick part of a q-tip to open the mouth, but I don't know how safe/stressful that would be. I'll go ahead and add the moss to each hide like you suggested and keep an eye out for other symptoms for a couple of days.
Not to derail my own thread, but since you mentioned cypress mulch, would you mind sharing where you get yours? I'm currently using aspen, but it's either too shredded and dusty or too chunky and I'd like to switch.