Gary, (anybody) whats the best way to remove Xenia from live rock, I started off with a couple of nice looking stalks, now I have a forest! Looks cool and all, I just dont want a takeover...
I have had success keeping xenia under control by this method:

when I do my weekly tank maintenance ( water change / syphoning) I identify with stalk and or stalks that I want removed

then I just use the hose that have for syphoning in hand and I slowly move the hose over the xenia that is "marked" and with carefull urgency I vacuum the xenia away.

just be careful not to let anything coming from the departing xenia to escape the tube or you can have other xenia popping up in other places...hope this helps