yes, but even if the staple diet is bloodworms and brine shrimp, it may be too much protein. bloodworms and brine shrimp should only be given as a treat or to induce spawning.
goldfish are vegetarians, they will shred most aquarium plants that you put in there.
Boil a piece of lettuce until it's soft and feed your goldfish with it. It will be good for hte goldfish and can be fed as a staple diet.
de-shelled peas are also good. de-shelled peas help guard against swim bladder disease. If it already has swim bladder disease, there is a goldfish trade secret. ORANGES. small pieces of oranges will cure swim bladder disease. Oranges can also be given as a treat. (oranges should not be used as a staple diet because too much will alter the pH of the water)