ID alae
 

http://i284.photobucket.com/albums/l...ps0d24600a.jpg


http://i284.photobucket.com/albums/l...psb539c66a.jpg

could be:
Caulerpa verticillata or Cladophoropsis sundanensis



do your tangs eat it?

I only have a dogface puffer and 1 chromis in the tank. Bout some mexican turbo snails and astreas snails (corect name?) and they don't seem to eat it. Running a skimmer as well as carbon and gfo in a reactor. Thinking about trying a lawnmower blenny

Try this slideshow

http://www.reefkeeping.com/issues/20...ides/index.php

That would be my vote

Yes that is what it is. Gonna get a lawnmower blenny and some electric blue hermites. I have been manually removing it but it keeps coming back.I have been doing my best trying to remove the root , but it wont stay away. Its a fairley new tank so hopefully I can get rid of it before it spreads.

Thanks for the help with the I.D

How big is the tank? a rabbitfish would make short work of it most likely, but they need large tanks.