Some tangs are really skittish and take a little longer to recognize food sources. He might just be highly suspicious of the clip. My blue tang, about 5 years old now is still a huge chicken and is scared of anything I put into the tank at first. Give him some time, I'm sure he'll figure it out.
Something to try is to change the delivery method. What I do is wrap seaweed around a tube like 1/2" PVC with a rubber band and stick the tube in the tank. It is weird.. at one end I'll have a clip and the other end i'll have the tube. My blue tang will eat off of the tube but not the clip. Other tangs will eat off of both.
One other thing you can try is other leafy matter like Romain lettuce. My tangs LOVE romain lettuce more than seaweed! If they do end up liking Romain lettuce, try wrapping it together with seaweed so that when the eat the romain they'll probably end up nibbling on the seaweed as well.
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