I wouldn't know, sorry. I'm in NSW and we don't seem to have them here .. yet. I just came across this site: National Fire Ant Eradication Program | Home Treatment
I then clicked on Treatment types and Bait safety. There is a video, which I'm about to watch. See if you can find anything on the...
The fire ant issue is an interesting one. In Brisbane, Australia, the city council wiped out all fire ants from local parks etc, but the home gardener has to struggle on. hmmm
How to Get Rid of Ant Hills in Your Backyard: 9 Easy Methods
Mad Backyard
I like the tamping method and remember jumping on anthills in nan's backyard. She had the sandy soil mentioned in the post.
I've not had ants in the coop, so I can't say this is chicken safe, but I use baby powder on my front steps and dry garden areas where ants have been a bother for years! I had to run from the mailbox at one stage, so each day I took the powder with me and covered the ground. I haven't had ants...