I swear by Terro. Had an ant problem a year or so ago, put that stuff out, took about 3 days to kill all of them and haven't seen them since. There's a couple of different products from them. I used one that was a little squeeze bottle. You just tear off there little inch squares from the package, add a couple of drops on each one and put it near the path of the ants. They're so small, you can easily put it in an area unreachable by your tort.