If you keep your food sealed (in ziplocs maybe) or even in the freezer it will stay nutritious longer. And you can buy liquid vitamin supplement to add to dry food. I don't think goldfish should have earthworms (too high in fat) but vegatables should work. I've heard of lettuce, squash, zuccini, peas all being fed to fish. Search old threads for how to prepare (i've heard of clips, rubber bands, boiling water baths, etc.) Alway remove anything uneaten after 24 hours to prevent fouling the water.
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