Looking for scientific name for this Algae

[don.ald]

https://www.dropbox.com/s/tscoesfu6hvt1wo/2012-11-15%2014.02.09.mov

[freezetyle]

halymenia?

[11purewater]

Is it leafy or fine stalks?or fern like?

[FragIt Dan]

The more you can zoom in at hi res, the better. To properly id, you need to see leaf formation and delineation, stock and base formation, all kinds of stuff that you can't tell from the video. A guess would be the best you could get from your video :),
Dan

[don.ald]

Found
http://www.aquariumdomain.com/viewMarinePlantSpecies.php?id=2