I would love some input on this as well. We have small and large ants everywhere. So far the chickens are not eating many of them (they are still young) and I worry that they will get into the coop and harm them. I have tried cornmeal and vinegar and baking soda and boiling water. Nothing works. The ants still manage to survive and keep coming back!! 

 I have not tried DE yet, but if that doesn't work I may have to call my local pest control guy...just wondering what sprays are safe around chickens and gardens...