Its more like an Anthellia does not pulse but grayish blue in color. It does spread like Anthellia and can become invasive. If you really want it make sure the rock is not touching any other rock surfaces that you dont want it to grow on. I pulled mine out because I needed more room for zoas . They are neat.
I have actually seen some blue "xenia" that would blow your mind-check the julian sprung corals book under blue xenia-it is bright green and blue, I am hopefully getting a frag next time we trade I will post some pictures of it-I wouldnt suggest buying blue xenia off the internet though it is the worst shipper.
I was in ORL and probably saw it at that same store back in January. I actually may have paid 60 bux for a frag of it. What I remember seeing was unlike any xenia I'd seen before.