Nori as food?

[Brent F]

I have a tank with invertebrates that I need to suplement feed because there isn't enough algae. I have heard mixed opinions about using Nori from a grocery store. Some say it is great for feeding algae eaters, others say don't use because phosphates will go up. Also, are dried sheets or the natural dried nori better?

Any suggestions for feeding algae eaters?