Have some good macro for free if anyone wants some. I'll give you a small handfull.
Grows easily, quickly, and is not invasive. Very easy to pick off if you don't like where it is growing. It's a harder algae due to it's calcium carbonate structure, so it dosn't break when you pick it. Good for exporting nutrients. Good in sump, or in display.
Halimeda opuntia is the style. - chain style, not clump style. Also known as 'cactus algae'
Here's a good read on it.
http://reefkeeping.com/issues/2004-04/nftt/index.php
