I'm having the same trouble with my Hippo and Scopas...won't touch it. I left the Nori out to get a little sturdier and have attached it along with a couple sprigs of Caulerpa (msp) to a piece of LR
rubble and put in on a piece of rock. They are interested, but seems the snails are more.
I have been giving them Ocean Nutrition's Formula 2 Flake and Pellet so they will at least get their greens. I don't understand why they don't like it..my last Tang ate it from my hand. Soaking in garlic doesn't seem to make a difference either. I even tried Bok Choy. Not..