Sounds like some glass anemone aka Aiptasia sp.
If so, remove them immediately. But dun just pull them out, it will make them propagate even faster. Follow the instruction on this link on how to remove them. http://www.wetwebmedia.com/marine/in...a/aiptasia.htm
See this link for more info on hitchhikers we get from LRs. http://www.reefs.org/hhfaq/pages/mai.../faq_rock1.htm
Cheers
JC
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