I've been feeding NLS pellets exclusively to my fish for a few years. But for tangs I will also supplement with Nori.
To get new fish to eat I will offer a wide variety of pellets, flake, frozen, and fresh clams on the half-shell, but I eventually wean them all onto NLS pellets.
I currently have a Regal Angel over 5 years old but she has become finicky lately ( she was sharing the tank with a very boisterous Achilles and a Desjardinii Tang and I think the stress has gotten to her).