I've had sucess with the species that infested in my friends display tank at his reef shop. We raised the pH with kalk to 8.4 and sucked them out with a turkey baster every other day for about 10 days. It took about 15 minutes of work each time. They dept cming back but in less volume. After about 5 times they dtopped coming back.
I don't get them in my tanks, thank goodness. I keep pH in the 8.15 to 8.35 range ,fwiw.
A year or so ago, a new coral presented some on it's base . They disappeared in a few days without infesting the tank.
Whether or not elevated pH will work on a specific species or any at all is still questionable but worth considering along with manual removal,imo.
This article provides information that may be helpful in your casel:
http://reefkeeping.com/issues/2006-11/rhf/index.php
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Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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