pulsing xenia

I have a beautiful piece of pulsing xenia that grows vigorously. Every
month of so I cut it back to try and control it. Sometime little pieces
of it fly loose and set hold on my live rock in places where I do not
want it to grow.

I was wondering if any one had suggestions as to how to control the
spread and growth of this coral.

Do you think I could mix up a solution of kalkwasser and water and
directly spray it on the small pieces that are trying to take hold to
kill it.

Any other suggestions of how I can control this vigorous piece of
coral? THANKS