I'd offer it a varied diet of quality foods. LRS reef or herbivore frenzy, reef nutrition, LRS seaweed, ocean nutrition formula 1 & 2 pellets, PE mysis pellets.
All I could get my blonde naso to eat for the 1st few months was pellets. I fed them Hikari pellets and really liked the seaweed extreme. I like feeding my fish frozen food with some pellets every few days. The other day I bought some live brine, 1st time in years, well the naso loved them. So the next day I fed a variety of frozen foods and he now eats frozen.