well I like to keep them, so please don't go hating for commenting this but... not all ants are bad. some are actually important to local ecosystems, I've studied them before, and some hunt common pests like cockroaches.
Would it be ok to be dog-sized ants, Ik there's too little oxygen but this is high fantasy, So It should be possible. (the dog-sized ant is the queen workers are kitten-sized)