New to the site and to beekeeping. I installed my nucs (3) on April 27 into their boxes and have thoroughly enjoyed the bees so far. I have 3 hives and have to fight myself from going in them everyday as this is new and exciting to me. Every colony has already started drawing comb out on the 2nd and 9th frames, but only on the sides towards the middle of the boxes. From everything I've heard and read i am approaching the time to add another box on top of the existing brood chamber. My dilemma is whether to run double brood chambers or single brood chambers. I am wondering what the pros/cons are of each setup - my current thinking is to have double broods on two hives and a single brood chamber on the other. Any thoughts/advice would be greatly appreciated.