Nice! They eat bird seed? I fed mine dried mealworms all winter. I’d soak them in water and sprinkle them with some calcium carbonate, they seem to really like it. So did the Yellow Warblers, Wrens, Blue Jays and Robins. I chased off the Starlings as much as I could. I tried to get them to eat some suet balls but they wouldn’t go for it, they’re picky.
I would say start with the live meal worms when they start feeding young. I usually just do around 5-6 worms per bird, including blue birds and hatchlings, in the morning only. I sprinkle calcium carbonate on them because mealworms are calcium deficient. During the summer they are more than capable of finding food on their own that has all the nutrients and water the hatchlings need, but I feel like giving them some mealworms in the morning helps them get some quick and easy food for the young and themselves after going all night without eating. It’s defiantly satisfying see them take it to the box.