Lexusboy,
I have some of this in my fuge too. It's doing well but only after adding a light upgrade. It seems to prefer rather bright lights in a moderate current. It's finally started taking off now for me.
As for nutrient export, I don't really know just how efficient it is in comparison to other algae's but it does help export.
Maybe others with more personal experience can elaborate. I can tell you, if you can get it to grow, it will export some nurtients, no matter how small the amount. It has a bad reputation for giving it's owners a hard time though.
Hope this helps.