Spawn of satan IMO..
I will never put xenia/clove polyps/green star polyps/anthelia or any other similar coral in any tank unless I want it eventually covered by that stuff..
"isolation" is simply not reliable/guaranteed.. removal depending on the type can be fairly easy to downright impossible..
The only reason I broke down my old tank was Blue Anthelia.. Started with a 1" frag.. 8-12 months later it covered every visible surface of rock in my 72" long tank..
I had a 1" frag of the Blue Anthelia as well. It was starting to spread off the plug, and all of a sudden it died with in 2 days. I consider myself blessed actually. I wasnt even upset. Im uncertain if I will go with something like this, but its why Im asking the question.