I am a novice SW reef hobbyist with 2 10-gal tanks. I just purchased a feather duster which arrived with no instructions.
How should it be placed in the tank (its now just lying on the sand bed)? What does it need for food?
you mean your critter did not come with instructions, how dare they forget them. i wish they came with instructions.
how long has the tank been set up? feather duster are plankton feeders. if the tank is over a year old then you may have some plankton already in the tank. if it under a year old then you are going to have to feed the feather duster. DT's seems to be food of choice for plankton feeders. you can pretty much place the duster anywhere you want. it just needs to be in a current. not strong, just enough to make its arms wave. this is how it gets its food.
Get a liquid phytoplankton for these guys. Most aren't fed properly in the stores and tend to be starving when we buy them. The smaller the 'bits' in the phyto, the better. You can target feed them, they get used to the slight current you create and don't withdraw after a while.
Good luck with yours, I gave up on them because I couldn't keep them for more than a year before they dumped their feathers- they're actually quite difficult to feed.