Hi Doug,
The Naso is a grazing herbivore so the main part of its diet should be algae and seaweed. You can try commercial varieties of red and green seaweeds and tender romaine etc... but I have found mine won't eat the prepared foods. It grazes off of natural occurring Dictyota and Lobophora primarily. I need to grow the Lobophora in a separate tank as it mows it down otherwise. If you are coming over to The Hidden Reef on a particular day I can drop off some samples of seaweeds to see what your tang will go for.
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