A week and a half ago Dr. Bruce Carlson spoke at our club meeting. He ran the show at the Waikiki Aquarium as director and has just left to start up an aquarium in Atlanta with a $200 million grant that will be opening in 2005. He's very well known in the industry and has accomplished many things in Waikiki alongside Charles Delbeek.
In his lecture he included "Projects that had failed". One of these projects was an attempt at keeping Dendronepthea long term in captivity. He showed the whole project, which included an elaborate current simulation system, along with frequent feedings of many different types and sizes of planktons. Here is a link to an article describing it and other projects. Search on Dendronepthea and you'll see the results. Since the article all specimens of the genus were lost.
http://www.advancedaquarist.com/issu...02/feature.htm
I'm not saying nobody has had success, just relaying the findings of people who dedicate their lives to the hobby with the best resources at hand.
Anyway not to discourage you, but this is truly a coral where calling it "for experts only" is an understatement. They should be left in the ocean and to dedicated institutions until their secrets are cracked.