I installed this package of bees into a freshly built hive about 2 weeks ago. I gave them 8-10 "brood" sized bars. I have some spacers for the "honey" bars but have not used any yet. It appears as though they are pretty close to occupying all of the bars as you can see in the photo. When is it generally accepted to give them more bars? Is there a technique for adding additional bars? Like where in the list to insert them, how many at a time, etc? Thanks for your input