Yup, t. immigrans for sure. Like AsdinANTS said, great beginner species, really easy to care for. one thing I love about this species is that they'll eat basically anything, not just meats. They are largely scavengers. Sadly I've seen these guys wipe out Camponotus and Formica species just because of their sheer numbers and tendency to be aggressive. So sad. But yes be careful, as they grow crazy fast!
I don't think you injured it, these queens are pretty tough (I'd know, I found a bunch drowning in chlorine water who survived just fine). This is probably just physogastrism, which happens when the queen has lots of eggs in her Gaster.
Hope your colony does great!
Manica invidia (1 queen, ~200 workers)
Manica invidia (1 colonies, 1 queens plus 3 workers)
Lasius niger (single queen, ~200 workers - naturalistic, predatory set-up)
Lasius americanus (1 colony, ~10 workers)
Tetramorium immigrans (3 colonies, 3 queens, ~ five workers each | 1 colony, 1 queen, ~1200 workers)
Formica aserva (aserva queen, ~15 Formica neorufibarbis workers)
"And God made...everything that creeps on the ground according to its kind.
And God saw that it was good." - Genesis 1:25