lol feather dusters are common in a lot of aquariums. Besides that there a common hitch hiker on Live rock, because of filter feeding from the water, they will always have a source of food. Same with clams, provided you have enough light for them, they will always have a source of food. You will want to feed every now and then of course but if you didn't, it probably wouldn't be detrimental to the clam or feather duster.
