My newest Kole Tang

[daplatapus]

I've had one for a little over a year and is one of my favourite fish. Like you're experiencing, until they're comfortable they may be a bit reclusive, but as they get used to you that will go away. Mine absolutely LOVES nori. Doesn't seem to make any difference what kind. I do think they prefer green algae to brown as mine won't even touch the dictyota algae I have in my tank. If you haven't had to buy some yet for anything, head to the grocery store and in the Asian isles you'll find it for making sushi and stuff.