Hi,
I live in Salem Missouri (south Central) and I have two new hives this May. Started out well both hives grew quickly now one much stronger then the other. Bees are a Russian Hybrid raised locally and gentle for the most part.
Last three weeks have been very hot and dry and have seen some robbing behavior. Added a top feeder to both and feeding heavy and added a reducer to the weaker hive. How long should I keep the reducer on? It has been suggested I take two brood frames from the strong hive and switch with two from the weak hive. Any other suggestions?

Thanks