Lice.
Picked up some really nice (all things considered) feeders this evening, and actually held back a couple for my own breeding stock. (blue dumbo, hooded dumbo, and something pretty not-sure-what-it's-called) Anyway, as I was rinsing off the ones I euthanized (LONG story...let's just say, they smelled like vinegar.) I noticed the little buggers on their bellies. Sure enough, Lice. And I didn't think to look BEFORE I contaminated my nice, healthy breeders. greeeat.
Guess I'll be picking up some Ivermectin, too.
Grrr!