Oh and new way to kill your ants: let them fight other ants.
I lost another M. mexicanus, the crucial adopted nanitic, probably because she fought and killed another M. mexicanus a couple days ago.
Similarly, when Tetramorium escaped and invaded other ant colonies, there was a high casualty rate up to 3+ days later.
P.S. I am not advocating ant fights. It just happened unexpectedly a few times 
Edited by OhNoNotAgain, November 23 2020 - 5:43 PM.
Past & Present
Veromessor pergandei, andrei, stoddardi; Novomessor cockerelli
Camponotus fragilis, Camponotus sansabeanus (inactive), vicinus, laevigatus/quercicola, CA02
Pogonomyrmex subnitidus, P. californicus (inactive)
Liometopum occidentale (inactive); Prenolepis imparis; Myrmecocystus mexicanus (inactive); Tetramorium sp. (inactive); Lasius sp.
Termites: Zootermopsis angusticollis, and a box of drywood termites that can't be seen
Isopods: (most no longer keeping) A. gestroi, granulatum, kluugi, maculatum, vulgare; C. murina; P. hoffmannseggi, P. haasi, P. ornatus; V. parvus, P. pruinosus, T. tomentosa
Spoods: (no longer keeping) Phidippus sp., other