Thanks for the replies. I learn something every time I log in here.
Truth be told, I may have incorrectly labeled my enclosures as Vivariums. While they are both designed to LOOK like natural habitat, but for the snake (and now ants!) there's nothing actually alive in there.
This ant infestation is getting out of hand in one of the enclosures, so I'm strongly leaning towards using Terro Ant Bait. I just don't want to hurt my snakes in doing so. Hence my original query. But all replies are deeply appreciated.
<><Peace