It is amazing how small the ants nests are. Those tiny buggers would always invade our house in S. Florida too. Hated them. Could not leave anything out. Bread had to be kept in the refrig. It always looked like a had a lot of food in the refrig but really it was all the things that I wanted to keep away from the ants. We tried everything to get rid of them. Each year they came back. The house had wooden siding so they had a lot of entry points. We just considered it part of living in the tropics!