Hi I'm Pete with Greenhouse Pest Management, we are Atlanta's true natural pest control company. So the best way to determine whether you have fire ants is by using a rake, and disturbing the mound. That is going to explode with different types of fire ants, but actual different sizes. Be careful, because they are very venomous. One thing that we want to do is we want to go ahead, and use an organic pesticide residual spray again, and coat the whole entire mound, and make it into a mud consistency. Allow those residual particles to bond with the actual dirt itself, and that is going to work as a contact killer killing all the ones that are active. But it is also going to eliminate the ones that are actually starting to develop, and starting to hatch out from it's pupae stage.