Xenia out of control

[seaweed88]

I put a small start of Waving Hands Xenia on one of the rocks in the lower half of my tank. It is no longer small and to remove the rocks it has covered will require moving half of my rock. Any ideas on how to kill this off. I really do not think I have any other options.
Thanks
Mark

 

[BlazinNano]

KALK PASTE!
If you tryto cut it or scrape it off if any part of it is left it will grow back.
You can also just kill the whole rock by sitting it in the sun.