In a bare tank with just an airstone you'll see the baby dusters in the corners, hanging onto the sealer, and a few on the floor.
Your best bet though is to use some base grade live rock so more of them will have a good attachment point. The rocks will be transformed into "worm rocks' in a month. Good live rock will work too as long as it has no tunicates or bivalves or other filter feeders on it which would eat the duster larvae.
It takes about two weeks to see that you have ..something...but about 3 to see that they are featherdusters.
By the way, you won't be able top raise them in a nice sparkling clean tank. They'll need a "wild meadow" style dirty, lived-in tank with lots of stuff floating in the water.
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