How long have you had them? If only a day or two I wouldn't worry. In any case, if the breeder was feeding them fresh seafood you can pick up some Prime Reef cubes. They're a mix of many different meats and your fish should see something in there they like. Don't get stuck on getting them to feed on nori, that will come with time considering they've never seen it before.
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Conduct your life like an orchestra, and keep your attitude in tune.
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