Awesome concept of a tank for them, feels like a child dream of mine.
One thing id like to point out would be Ambient temps and humidy, that in my opinion is the toughoust point when keeping any ant in the end.
As you did show on the introduction to their new tank the soil was muddy as it felt to be in their natural habitat, yet we mostly keep open lids for them (i don't yet have a colony in any open substrate setup).
I think using a lid with all necessary access and aeration intakes will Hugely improve the biome we want to offer them (feel right like home) i would like to follow up because i entend to have colony in a smaller 12 Liters tank, and the fact that the dirt towers on your nest entrances look quite dry. Would you agree if i say that they would have better chances if the overall humidity was constant ? (as an indication the dirt would be all evenly colored.
I think i lost most of my over all ants to those conditions, not only because of humidity and other species.
Charing ideas would help me out alot.
Again great Work on all of your habitats and inhabitants.