I had them a few months ago. Lost quite a few colonies and the entire contents of the prop tank. I cannot say what exactly did the trick but they are gone !
A few things I did do was to be sure to scrape out all the eggs as I found them. If a colony was "infested", I removed it and dipped then shook in a lugol solution. I blasted the colonies in the tank every day or so and added a melanarus wrasse and a christmas wrasse (no sure of scientific name but it looks very much like the melanarus).
Like I said, I lost alot but I saved more than I lost. I did save a few of the infested ones as well.