I've been wanting one for a while just never had a tank big enough.Congrats on the tang! Kole tangs are one of my favorite fish and often overlooked.
In my experience the fish will do best when learning by watching from other fish that eat the algae. Do you have something like a foxface or lawnmower blenny that already eats the nori?
Garlic definitely could help.
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It took my kole Tang about two weeks of hiding and watching everyone else eat the nori before trying it out. I just kept putting it on the clip in the same spotPicked up some garlic extract and soaked some nori. I put some in a clip and some on a piece of rock hopefully he figures it out.