i have two feather dusters, both very pretty i have always hear that they are very hardy. They are filter feaders and feed on some of the same stuff that unwanted algae also feeds on. I would say get some. I don't know anything about reproducing.
I have two FD in my tank, one is a large one. I've had them for several months with no problems. Nothing in the tank picks at them. I enjoy watching mine and people that come to see the tank love it when I make them suck back in.