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From: TW

Does a Featherduster worm need any special acclimation process, or special care? Do you attach it to a rock or the coral substrate or do you just place it on the bottom of the aquarium and let it find its own way? Do you stand it up or lay the worm casing on its side?

I have several featherdusters in my tank. IMO, my featherdusters do not need any acclimation process. They like constant currents that are not too strong to blow off the crown in disarray.  They do not need any lighting too, as their stretched out crowns will filter out any food carried by the flowing current. I personally do not feed anything to it except an occasional drip of coral filter feeders for my other inverts (I think they take them too!). You may do whatever you like (to stand it in the substrate or attached to a rock by its side, please make sure the rocks will not hinder the opening of the crown, the end tip will secret sticky "adhesives" to attached itself to a solid foundation after a while.  On the whole they are very easy to keep.

From: C

You should probably acclimate your feather duster over 2 hours by the drip method, as it is a living creature.  I didn't do that (when I was still low on info!) and suffered no ill effect.  I have found that there is a mysterious little nibbler somewhere in the tank that continually munches a hole in the dusters cases... so I have put the tail (closed off) end into rock, a barnacle shell and anywhere else somewhat protected.  Put them in the current  strong enough for the heads to flutter, but not so much that it looks like a palm tree in typhoon season!  They are filter feeders, so as long as there are little things floating around you don't have to do anything special for feeding.  Position them with the closed end down, and put them where you want them.  They can not move by themselves to a better position.