I use bait traps. I purchase Tarro brand(available in my town at Ace hardware store) it is a small clear flat trap with insecticide in it. I have a rail around enclosure at top edge and thats where i put it because my boxies cant climb up ther since i have a lower rail below. You can place it around outside and it will still draw the ants to it. Works great indoors so i tried around turtle pen and now keep it out always,just replacing if empty.