if you want them gone,don't cut them,the stump will grow back.rip them from the rock using hemostats.if any is left behind,wait for it to get big enough to get ahold of and rip it off again till they are gone.they are not hard to keep under control or get rid of this way unless you can't reach them,then you have a problem.
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55 gallon reef with 4x54 watt t5,29 gallon sump,red monti cap,1blue echinophyllia,trumpet,red lobo,2 toadstools 1purple and 1neon,gsp,xenia and yellow xenia,red ,many mushrooms,2 giant frilly shrooms,cabbage coral,yellow polyps,many zoos,1 orange and one neon green nepthia,duncans,cladiella | 
