Ants are a huge problem where we live. Fire ants bite and the black ones ruin your foundations. The old tale apparently is the reason gutters are not installed in the south is so that water purposely sits beside the foundation after it rains in order to flood out the ants. Makes sense to me. Ants will burrow holes under your foundation and in this case your Pavors and will cause them to sink. What we did and what you can do is pull the Pavors pack more sand in the holes created and mix in a little Portland cement. That way next time they try to make a home it will be much more difficult. Of course spraying heavily year round helps these issues out to.