Yes pleaseI wouldn’t feed it to freshwater organisms. Stick with fresh vegetables (I can post a list of safe ones if you like) and quality food.
Our Dalmatian Mollies love it!Yes, fresh and salt water fishes and shrimp will all eat seaweeds like nori.
Yeah, lots of people feed it to surgeon fish (aka tangs). Also marine angelfishI’ve seen tangs (I think) eat it