Macroalgea?

[Soccerdude]

I've been wondering, is there any good, hardy lowlight Macroalgea species out there. I have a 46g fowlr setup with about 2. Watts a gallon over the top. I know corals and anemones are out of my league but on the face of it, macro algea seem to offer great aspects like beautiful appearances and filtration capabilities.

Any suggestions would be greatly appreciated