Everything you mentioned besides the feather dusters, are NOT filter feeders. They also do not need supplemental feedings to thrive, and get most, if not all of their nutrition from your lights. They do however benefit from small feedings every once in a while, but feeding is certainly not required. Coral are photosynthetic.
The feather dusters you have don't need supplemental feedings either. It's been proven they do just fine without feedings in aquariums because they catch whatever particles are in the water column and whenever you feed the fish in your tank, they catch scraps and particles from the food.