Red Macro Algae, Helpful Like Chaeto? Reefin' Faq!

[ech0o]

Was buzzin' through eBay and came across a very neat macro algae, it is red and thick, and branches just like coral.  The piece was even glued to a piece of liverock.  Anyone keep any of this stuff?   How fast does it grow and does is help strip excess nutrients like the chaeto does.  A good thing to put in your reef?
 
Here is the picture from the seller.
 

 

[Donya]

Is it round? If so then it could be what's usually called "red bamboo algae" or "red Caulerpa," but I don't know whether it's even in the Caulerpa genus TBH. Unfortunately I don't know if/how its needs differ from any of the other commonly seen macros in the trade.