Try attaching the nori to a rock rather than putting it on the clip. I've had success with kole tangs with this method before, and I believe its due to their eating behavior of rasping algae off of the rocks. Mine would never touch the nori if it was on a clip. Also you can try the hikari seaweed pellets if you want to go another route. Iv'e used them before in my tanks and tangs go berserk over them.
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