That appears to be the right stuff. And wow, no oriental markets! I actually have a choice....about five within maybe a ten mile radius that I'm aware of.....and my favorite is H-Mart....very clean and a choice of 50 different algaes.
Now here's what I do when I get home with my package of seaweed.
I first cut it into quarters. I have a dedicated cutting board that has tape on it that helps center the nori. I typically take a bunch....maybe 10 - 15 sheets....and using a straight edge and sharp razor, cut the nori up and package in sandwich bags.
When I'm ready to feed, I take two of these smaller pieces and first fold it in half and cut on that fold using scissors.
I fold it again in half and cut once more on the fold:
This then goes into the algae clip where I now cut thin strips of up the length of the algae
When you're done cutting, you now have bite-sized strips for your fish to eat.
When I started feeding algae I didn't do this last step and my pig fish would rip out a whole sqaure of algae that would then float around the tank. Cutting into strips now gives them just the right size so that if it does get pulled out, they swim over to gobble it up.
Hope this helps.