So far I haven't seen any robbing activity. Generally the bees seem to keep to their own hives. I do have carpenter bees in my yard, but haven't seen them at the hive. Maybe the squirrel I heard moaning on my deck tried to rob and was stung!
I don't know when to remove the feeder. I haven't put a honey super up yet and thought that when I did that, I would remove the feeder????