They will eat anything but make sure you give them Nori as well as they are mainly grazers. Go to your local Chinese shop and buy some dried seaweed, it is far cheaper than Nori from the LPS but it is the same stuff.
As above. You can also feed blanched spinach, frozen peas, hake, prawn, calamari. It's better to find out beforehand what the fishes requirements are. Be aware that the spines are poisonous, so clean your tank carefully.
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