Need more info. How many bars in this hive? If they've filled all the bars in the hive it's too small. They'll either basically shut down and just hang there or swarm. I put an empty bar in the middle of the brood nest periodically to keep them going. Haven't had a swarm yet. but my TBH is 48" long. They haven't filled it yet. If they do, I'll put a super on it.