My new tuxedo urchin has decided he is going to knock my little xenia frag off it's perch on an almost daily basis...

Is the marine epoxy sold in fish stores pretty tough stuff? I would like to be able to just snap off the frag if I need ot move it, but I would like a solution permenant enough that the urchin isn't going to make the xenia practice high diving on a regular basis...

so... tough... but not tough... or is there a great resource out there, widely available that i have so far been dense enough to miss?

Thanks guys! (and gals)