Has anyone had a shaving brush plant?
http://i16.photobucket.com/albums/b21/shelijo/shavingbrushplant.jpg
(photo from liveaquaria.com)

Is so, does it really help a nitrate problem?

What is it's lifespan?

Any comments on this plant?

I've never had one and can't speak to their specific care. But they will reduce nitrate because they will take it up as they grow. I don't know that they would help as much as chaeto or caulerpa because they may not grow as fast.