I always used a clip for mine and that worked fine--until I got my Foxface. He's about eight inches long and attacks Nori, tearing it to shreds. The other fish clean up what he is spreading around the tank for awhile. The problem is that they get full and he is still attacking all the Nori I can put in for him.
I've never seen that Foxface eat till he was full. I have a nearly seven inch Sailfin Tang that will also eat about anything green (including hair algae) but it gets full long before the Foxface and stops cleaning up after him.
So, I have to put mine in one strip at a time and don't bother using a clip. The Foxface takes it out of my hand before I can get it in a clip. I wouldn't put up with that sort of behavior, but he is armed.