Soon as my 2 tangs see me come in the room or get near the tank they come right to the top begging for nori.
Start feeding him nori with your hand instead of putting it on a clip. Like put your hand in the tank holding the ori and rub it between your fingers so little pieces float around the tank. After he notices where it comes from you will have a new best friend. I got my starry blenny sitting in the palm of my hand when i feed nori to the tank while the tangs try to rip it out of my hand. The hawian damsel even dive bombs and eats out of my hand. Its quite fun to do.
Anyways let it get used to the new tank. He is feeling like you would if a giant net snatched you up, put you in a bag, and tossed you in a foreign place like china or something. They are probabley worried about food, if they are gonna get eaten, etc