One of my 2 hives seems to be very weak. There are rarely bees at the entrance, but I do occasionally see bees coming and going. I looked up through the screened bottom and didn't see any bees in the lower box. I noticed some ants trying to sneak in the entrance today, with no response from the hive. I killed all the ants at the entrance and the conga line up the concrete block.
I'm not sure if the hive was robbed out by my other hive or if they are just downsizing for the winter. I refilled their feeder, put some pollen in the entrance and almost completely blocked off the entrance with some screen and wood. Is there anything else I should do to help ensure the hive does better? It's getting a bit too cold to go in to the hives