If they are not bearding late at night all over the hive, you don’t need to worry. They are just signaling to returning foragers where the entrance is. However, if you see this kind of thing, you should worry more:
If they are not bearding late at night all over the hive, you don’t need to worry. They are just signaling to returning foragers where the entrance is. However, if you see this kind of thing, you should worry more: