I also picked one up from Sharky's as well. He said that the blue-polyped ones in particular have been doing very well in his clients tanks. So I decided to take a chance on them.
I have mine under 130 pc in a 29. I feed the tank frozen mysis one day, and the new enriched DT's phyto the next. I placed it in a medium flow area. When I put the mysis in, I can see the direction of the water and it basically goes right through the sea fan.
So, I am crossing my fingers. When I went to Sharky's, I mentioned that I heard they were really hard to keep, and he said that THOSE in particular were not that difficult. However, when I went home and researched more, I didn't find any personal testimony that someone has kept them successfully long term. The basic consensus is that they starve to death by about a year.
In any case, I bought it, and now I'll try my best! It looks pretty good right now--really long polyp extension. We'll see...