Miracle-Gro AeroGarden Red Heirloom Cherry Tomato Seed Pod Kit for Hydroponic Indoor Garden, 9-Pod

I have many tomatoes but the foliage is so dense the tomatoes aren't ripening?? Should I prune?

MY tomato blossoms are falling off. Some tiny tomatoes have also fallen off?

what is the spacer? just empty pod?

Does this come with domes? I picked up the aerogarden at a yardsale with 1 Dill pod and nothing else so no domes were with it.