the bane of an aquarist... the pulsing xenia... if its any consolation to you it was one of the corals that got me into the hobby also and I've spent each day since trying to get rid of it..... its kinda like Mint in the garden, once you have it, you will always have some of it
The only good news is, as the previous posters noted, there seems to always be someone out there looking for it so frag away.
add rubble rock around the main piece where the xenia is, as it grows to the rubble take it to local fish and get credit!