no they don't need sponge based food. Did you quarantine the flame and make sure it was eating before putting in it into your display tank? While in qt offer a wide variety of foods like Larry's Reef Frenzy, prime flake, etc. If you already put it into your display tank and didn't qt, is it being picked on?
As long as it is getting some algae based food. NLS is a good balance food. I would not worry. I would keep trying the Nori. How old is your tank? It will feed off the algae off the rocks if your tank is mature enough.
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