I split off a nuc a couple of weeks ago with only one frame of brood and one frame each of honey and pollen and two drawn frames. I probably should have shaken a few bees into the nuc as well and added another frame of brood. Things are pretty slow right compared to the activity of the other colonies and I think I need to add more bees and brood. What would be the best way to approach this? Can I grab a frame of brood (with attached bees) and put it in the nuc without setting off WWIII?