Need some help from the experts . I baught this apis mellifera colony 3 months ago. When I baught it, there is only one capped brood, and other 4 frames were honey and pollen. For the past 3 months, the queen is laying on one frame only and there is no expansion of the colony. Basically, it still remain same like I baught it 3 months ago. When
I check the frame, I found some abnormality. Is this sac brood?