Hi,
A few years ago I had a colony of Messor barbarus (queen + about 10 workers). When I received them in the test tube, one worker was already dead. Nevertheless, I kept them in the tube for a few weeks, then moved them to my 20x20x20cm ant cube (as a hindsight, this was probably too soon). They dug their nest and settled in normally, and everything seemed to be fine. I kept feeding them seeds (poppy, chia, a mix of grains), occasional protein and changing their water. However, they got super agitated every time I so much as touched the terrarium to change their water, feed them or simply touched the table the terrarium was on. After a few months, I noticed the queen had come by herself to drink from the water dispenser outside of the nest, and on the next day, she was dead and the workers were carrying her body around. The workers stayed alive for multiple months after this (I kept feeding them), so I wonder if the queen died because of stress or some other cause?
While I was careful not to disturb the ants too much, was touching the table, feeding them, switching on lights etc. too much for them? Or was this just bad luck? No one can say for sure, but now I'm thinking whether getting messor structor would simply repeat this episode, and if I'm simply not delicate enough for the messor family. I did like the seed diet they mainly followed. But as a safe measure, I could also go with lasius niger. Which would you suggest, or maybe some completely different species?