My clowns and six line have no interest in nori. They actually don't really care for frozen mysis and would prefer me feed them PE mysis pellets. The tang ignores pellets, but will eat frozen Mysis, devours seaweed flakes and loves his nori clip. I feed a few flakes and pellets at the same time I use 1 sheet of nori a day. When I first got my tang it was very thin and I put in a sheet any time I saw it empty.
I just recently made my own frozen fish food with fresh ingredients from the grocery store. Cod fillet, scallops, shrimp and oysters, chopped them up fine, blended some of it and left some finely chopped. Froze it flat in a zipper baggy and I break off a chunk and feed the fish. They all go nuts over it, even my clowns that spit out mysis, and it didn't cost much for the amount of food I actually got. I even feed my BTA the same frozen, I'll just grab a little chunk with the tongs and set it on the tentacles. It'll grab hold and pull it in.