no I just catch the little boogers going across an area and either pick them or dig them out of the rock. Or burn them with butane lighter.
I have had these little Berghia before and they are like many types of species that they do to good of a job. They eat all of the Aiptasia they can find then starve out. But you know there is always the one Aiptasia they don't find that begins to multiply.
I was purchasing them from CaptiveBredcorals.com which is now a good company. It changed hands about 2 years ago and Craig Wilson runs it now. They have 4 or 5 4000 gal tanks that they propagate their own corals.