Would you mind a couple of words of admittedly unsolicited advice? Brine shrimp won't sustain your fish. Fish love them, but they have little nutritional value. I also would be surprised if those fish were very interested in nori. You should try a good quality pellet like New Life Spectrum. If you want to feed frozen, switch to mysis. They'll love it and it's good for them.
Sorry for the hijack, Steve.