Freah cod as food?

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I know it's been asked before, I just don't seem anywhere to find it. I often go fishing / diving off the coast of California, can I use anything for my tank out there? I think of Rock Cod, Cabazon, Perch, Muscles, Scallops in particular. Perhaps even the seaweed?

Is any of these going to be too fat or greasy to add? Would they introduce too high metals or filth near the coast, near a bay? And to add something else?