Need help killing a coral!

[04scoobysti]

Well i have a colony of Anthelia that i would like to get rid of completely, or at least manage it growth. It has been shading out my zoos and now it has spread to other parts of the tank. Im wondering if anyone has a way to kill this stuff before i have a whole tank full of it. Chipping it off is not an option and pulling it off manually only seems to have it spread out to the rest of the tank faster.
Any help would be appreciated.

Heres a Pic, the culprit is on the bottom right. It an older pic, so it has spread more covering the zoos.