It's usually new chicken owners that give praise to DE. As time goes by, they learn that it's not what it is claimed to be. DE wont even treat external parasites, much less internal parasites. Dont believe me? You'll learn eventually just like everyone else.
I have told you just about everything there is about worming, why should I not tell you the truth about DE? Take it from me, DE is a waste of money, save it for a bottle of Safeguard liquid goat wormer.
If you'd like to experiment and live where there are fire ants, dump some DE on a fire ant mound, then go dump some Sevin dust on a different fire ant mound, stir them up if you wish. Then go out the next day and stir both mounds up real well. Then you'll see which ant mound is fire ant free. Then come back and tell us about it.