Though I do not have a tortoise, one technique for eliminating ants I came across while living in Florida was to use hard liquor. I never determined if there is any scientific basis to it, but I was once told to pour a shot or 2 of cheap rum or vodka (i'm sure any hard liquor will do) down each ant mound. I was skeptical at first, and being a college student at the time fearful of wasting alcohol in this manner, but decided to try it anyway. I added two shots to a fire ant mound near my front door and sure enough it worked. Since then I have used it as a more environmentally friendly method of ant removal than pesticides. Hope this helps.

Chris

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