Pellets are certainly better than flakes, but I would second the plan of feeding them frozen foods. My one-spot and tangs get frozen Mysis and Brine (Hikari) and are thick, have good color and are healthy. I occasionally will throw some TDO pellets in for some gobies that hide a lot, and they will eat them, but it is not their main source of food. They peck at some of the algae on the rocks, but I never feed Nori and I am not convinced that it has any real value