Hi Robert,
No need to have 2 brood boxes unless this is a necessity for your area, such as really cold winters. I think you’ll be fine with one, do consider having a second box for honey storage over winter or a dearth in the nectar flow (such as a medium). There is a a lot of discussion on the best time to add a Flow super as many people are disheartened when the bees don’t seem interested. Time to add a Flow super is much the same as adding a normal super, there are certain conditions and you need to think like a bee and take notice of the flowering plants in your area as this will dictate when the nectar flow will be coming into the hive. Take a look at my earlier post on this very subject a short time ago.
http://forum.honeyflow.com/t/bees-dont-like-flow-hive/7148/2
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