When did you get the nuc?
Go back to the seller and get a new nuc. You do not have enough bees to protect that hive and the Small Hive Beetles will bee taking it over soon. I could not see any wet brood, I suspect you do not have a queen in this hive.
Sorry to be the barer of bad news. I would act fast, the beekeeper can add bees and eggs to save this hive to minimize his losses.
Jim