I got a Naso tang from my kids for Valentines day, unfortunatlly they didn't make sure he was eating. I have tried seaweed red brown and green. Is this Nori? Lfs says it is. Brine and myis shrimp. He swims freely and pcks at the rocks, no hidding. He was dripped acclimated for 2 hours so I don't think he is that stressed. Any suggestions?