I discovered this afternoon that my hive was being over-run by thousands of black ants. The whole outside was covered and it looked as though the girls were losing the battle at the doorway. I jumped into action and went on an ant massacre. After about 10 minutes, most of the ants were dead and the girls were calming down a bit. But, no sooner than I started to leave and the ants were amassing another army. I need some suggestions on how to keep them at bay. I can't find their nest. I have a perimeter of dishwashing liquid which does a good job of keeping the sugar ants out, but the black ants are marching right through it. I have powdered lime under the hive, but they are marching through that too! What can I do???