Melody,
We got a mixture called "Mound Drench". It was recommended to us by the people who sell us our plants and yard products. Setting fire to the mound would have ruined a really nice patch of carefully cultivated grass that we and our neighbors have managed to grow on either side of our alleyway.

Being from New York, I'm not sure you have seen houses that have garages in the back of the house and a shared alley way behind all of them. The folk on our side of the next street over also use the same alleyway. So the houses are back to back with an alley between them. All of our fences stop just short of the concrete drive thru the alleys. Each of us mows the grass behind our respective house. It's about a three ft wide strip. Anyway, the chemical is supposed to be good for the environment and not good for the fire ants. Fire ants are a part of life in this part of the country. But I plan to kill out any I find in my yard or the neighbors yards. They will too. It's just almost impossible to kill them out completely.

Thanks for being concerned.

Billye