Naso Tang not eating when fed...

[Haloreef]

I have had the same problem with two different tangs, achilles and red sea sail fin, I tried feeding every thing and they would only pick at the rocks. The only thing I could get them to pick at was nori. The first time I put garlic soaked emerald entree in the tank they went crazy for it. Now four months later they eat any thing.
Hope this helps.
Keith.