a new box??...2nd deep hive body??...2nd or 3rd med hive body??? How many boxes are underneath the one u just added?? I dont know if its a brood box or a super! I can say that if its a super you would had a super full of sugar water!
Like Mike says: you should feed until they have the brood chamber built out. Your brood chamber should be two deeps or equal to. Since you are starting on foundation only this may take a month or so. If you have other options do not use an entrance feeder.
You will be able to see if the bees are returning with pollen. Just watch them coming into the entrance. Their leg pouches will be full with yellow, red, purple or other colored pollen. I am not good enough to "see" if they are bringing in nectar. Some say they fly and land like a loaded tanker. Maybe landing rough or missing the entrance. I try to check on them internally every two weeks. That way I can see if they are filling cells with the nectar. You might as well feed them sugar syrup while they are building comb. I have a top feeder and make my own syrup most others do too. When I make it I put 5# of white sugar in a 1gal jar. Fill my teakettle with water. When it boils I stir it in until the sugar is dissolved and the jar is full of syrup. Be careful that the air bubbles coming up from the sugar do not splash onto you. Let it cool overnight and you are ready to feed. There are many ways to feed top feeders, frame feeders, plastic bags pails, buckets, etc.... Try to stay away from the entrance feeders if you can. Have a good time with it, experiment and you will find what works best for your climate and region.
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