I recently had to trim a Xenia colony that was getting too close to my anemone. As it was on a large peice of rock that I couldn't remove from the tank, I trimmed it in the display. Run lots of carbon if doing that as the coral will most likey secrete a toxic slime. Use a sharp razor and cut it with one clean cut with a cut surface area as small as possible to minimize infection.
Anoth method, takes time though, is to use a zip tie and slowly tighten it each day until the coral detaches itself.
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