I went out to feed the koi this week, and noticed something in the rocks, and took a better look.

I shouldn't have looked - it was a huge pile of ants.  (I hate ants.....just sayin'!)  I have no idea why they decided to all come out of their nest, but it didn't make me happy.....AJ dump diatomaceous earth on them.  When I dug them out the next day, they were gone, so hopefully they stay either gone, or back in their nest!