[mike31154]

In my experience they seem to prefer film algae growing on the glass, rockwork or any other surface of your system including powerheads. Of the 3 LBs I've had, only one took any other type of food. He'd eat flake etc. along with the other fish in the system. The two others, including the one I have now did/do not take anything else. None of the ones I've had ever took nori, although I've read threads with folks saying theirs would. I keep the back of tank uncleaned to allow growth of more 'stuff' in order to ensure he and my two mandarins have additional grazing opportunities. What size is your tank? My 77 seems to be able to support the LB fairly easily. The current guy does occasionally go thin for a day or so, but quickly fattens up again after these 'fasting' episodes.