Thanks everyone for the suggestions.....I did manage to actually pry the rock out with a good chunk of the Xeina on it. Only one other section to tackle.
Cheers All!!

I just killed a huge colony today. I use a torch and burn around the base. Makes it easier to peel. Then torch the area that it covered. Pretty sure it won't come back

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file fish will eat it

Ive been lucky . It wont grow in my tank .

Man that stuff looks cool at first but is super invasive. I gave mine away after cutting it off the rock. The tissue that was left re grew new heads by the dozen so I had to chuck the rock it was on.