what kind of macroalgae is this?

[ngik_nguk_2004]

anyone knows what kind of macroalgae is this?

http://www.dotphoto.com/SAN1/12/34/EC/i1234ECE0-BA36-4172-B660-EEC62806DFFC.jpg

Can i use it for my refugium? is it effective to reduce nitrat?

[kmk2307]

Try looking up Ulva and Enteromorpha. I'm quite certain it's an Ulvalean so it shoud like moderate to bright light and lots of flow. If you can make it happy w/ lighting and flow it should reduce nitrates well.

Kevin

[SuperNerd]

looks like ulva to me...