Im gonna go ahead and dissagree with this. I havent fed my yellow tang nori in months and hes healthy as a horse. In fact I havent fed most of my fish in months. Only food they get is one every 3 days they catch some left overs from me feeding my acans and stuff. for the rest they hunt for mole shrimp, amphipods and other copepods... my tang picks at the rocks n probably finds some algaes but I dont think they need it to be healthy. I will agree that they love it though