Well much like you i am also anal and about a week ago i found one lil black creepy on one snake! So i started to freak out! So like you i thuroughly cleaned all items in my rack and used some PAM since then i have not seen a thing. All of this happened right after i had changed substrate, so i talked to my local breeder about it and they said it is quite common to have mites in some of the bedding, so from here on out everytime i change out there substrate it will be treated before it goes in with them. So yeah i also had only ONE!