Is this like xenia or like GSP? You can probably try and get a razor blabe up under the mat and try to srape some off or if it is like xenia you might ever be able to just cut off the head and the base will grow back.
I have done both of the above on xenia, anthelia and zoos(scrape on these) with good results. I have a leather that I just cut a finger off when I need a frag
I am not sure on that specific coral but I think it is one of the hardier softies. GARF has some video of fragging some things as well.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,