I just can't shake them!! I have literally tried everything!!! I thought they moved once, but they've only covered the previous area and the new area. Boric acid didn't kill them, DE didn't kill them, Bait in a mason jar with holes didn't kill them. These mother summa's are not moving!!!! Is it okay to treat that area with a fire ant killer? I purchased Orthene fire ant killer powder. I figured maybe I could sprinkle on the ant mounts, wait several days, hose it down several times then cover it with cypress mulch? I have cypress mulch on the other end of the enclosure and the ants haven't gone anywhere near it. An employee at Ace Hardware told me Cypress mulch is a natural insect repellent.