[Mine eats the package seaweed at lfs. Petorama carries it. So does petco. I am not sure is petland has it. Oriental supermarkets are the place to buy the nori. but if you can not get there load a couple of pieces of the green sheet of algae for him. mine also will eat brine shrimp live and frozen. he also likes the frozen marine cousine. and the algae frozen. basically mine will eat anything that i throw at him even mysis shrimp and chunks of regular shrimp.]
[you could also try spirolina algea wafers sold for fw fish. Make sure the wafer sits where the blennie hangs out. If the blennie is still trying to graze and samples the wafer most likely it will continue to feed on it-my LMB all loved them.]