Coral beauty stopped eating nori, algae sheets

Anything dried should not "go bad" but it may lose flavor if not sealed properly, just like crackers don't go bad, but they can taste nasty after a while. Depending on where it's stored and if it's sealed well or not, it could've taken on the flavor of other things around it. Or just gotten stale.
 
My coral beauty won't touch nori at all. Never did. Loves spirulina brine, and mysis, flake (both formula 1 and 2). I and pellets. He nips at algae on the live rocks though.

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Maybe it acquired a taste for your corals and no longer nori. LOL JK

Try not to leave the nori in the tank too long, it tends to wash out and no longer tasteful to fish. I leave mine in for a an hour before I take out what's left. Usually never anything left with tangs and angels in the tank.
 
Thanks for the replies, nori has been in the ziplock it came with. I'm gonna try the brine spirulina
 
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