Going back to the mite situation, most enclosures will have some kind of insect population living there, whether it's mites, isopods, springtails etc. I once housed dwarf white woodlice inside a Lasius Niger colony, and they helped clean. I'm always very cautious if I use substrate nowadays, back in my early years of keeping I used a tropical bioactive substrate as a digging material for a Myrmica Rubra colony, about a week later I noticed small white mites crawling over all the workers, you could see them stressed and agitated, within a week later they were all dead.
Lovely shots by the way! Glad to see she's laying again.
Edited by Coops, December 7 2017 - 3:07 AM.