I own a Kole Tang, and at first he didn't want to eat anything I fed him for the first week or so. But then I started feeding him algae wafers and now he/she loves them.
Just a quick update. I rubberbanded the nori to a rock and he started eating. I then started putting it on the clip and he ate it there. Then I put some frozen food that my local pet store makes in there and he ate it. Just yesterday I put him in the 75 gallon tank where he is doing fine. He's in there with a chalk bass, royal gramma, spotted cardinal, and diamond goby. Peace hasn't been established yet, but hopefully will soon.