Not interested in nori?

Get a piece of small LR, then soak your Nori in water until it is very soft.

Lay it on top of your piece of LR & press it onto it as much as you can.

Now throw it in the freezer over night. Once frozen drop it back into the tank.

Tangs are grazers, they like to pick rocks. They arent always used to swimming up to a clip.

Once they are used to eating it, you can try a clip again.

Good luck
Craig

 

i think bbthebest used rubber band's to hold it on his rocks

 

yes I do use a rubber band to hold it to a rock, they pick at it and what the fish don't get the small snails and crabs will eat from it also.
works good for me

 

might want to try that would be a lot faster thane trying to freez it to a rock

 

glad to help!