I have a large blonde naso that is quite fat. He absolutley refuses to eat dried seaweed, never has eaten it. His favorite food is frozen spinach.
I feed all my fish a varied diet. He gets frozen spinach, formula 1, formula 2, spiriluina formula, mysis shrimp, brine shrimp, angel formula (feed it to me queen, but the naso also eats it), spectrum pellets, etc. I focus on the greens, but give him a little bit of everything. I feed 2-3 times a day.
I probably overfeed, but I do weekly water changes and my fuge also helps to keep all water parameters in check.
I'll try to post a picture later if I can find a digital camera to borrow.