Oh boy! I was hoping it wasn't something like that, and was just the diet of night crawlers.
I'm going to call my vet in the morning and make sure they can perform fecal exams. I'm sure they can, but never hurts to ask first. As soon as I get a "specimen" from him again I'll have it checked out.
Hopefully, parasites aren't the case, but if it is I want to have it treated ASAP.
Anything I can do in the mean time? Like I said, he's pretty healthy otherwise (good appetite, active, clear, responsive eyes, etc)?
Thanks Grif.