Most of the Goldfish Flakes available at the pet shops are OK. It is always good though to suplement their diet with a few Earthworms occasionally.
You don't feed goldfish lettuce. Goldfish are not vegetarian or herbivores they are omnivores. They should be fed a proper diet of commercially available Goldfish food supplemented with a few earthworms occasionally.
There are many different Goldfish foods available at most Pet Shops. They also really enjoy a feed of earthworms too. Aha Shark stools
Goldfish food is commercially available at most pet shops. But I believe you would be hard pressed to find a better food for goldfish than Earthworms.
you can get green plant weed which goldfish eat but get your goldfish food as soon as you can! Also you can try feeding your goldfish romaine lettuce, cucumbers, oranges, spinach, duckweed, bannana, watermelon, and cleaned chopped-up earthworms.
yes, they are good for your fish when chopped up, but dont use them daily. if you want something other than flakes for daily food, use blood worms. The best thing to use is baby brine shimp, but they can be expensive and hard to find.
Goldfish are like people. They are omnivorous and need most categories of foodstuffs. So yes algae is good (like vegies) for them but they also need proteins and carbs. The better commercial goldfish foods are OK as a basic diet but are all lacking in something. The best way I know of to improve a goldfishes diet is to feed them earthworms at least once weekly.
Earthworms and baby fish
Earthworms live in soil and feed on decaying matter.
you can feed them peas or zucchini
You should not feed goldfish soup.
I am guessing you have your word order a bit mixed up and wish to know what food to feed to a Goldfish. There are many brands of Goldfish food available at most pet shops. Most of them are OK. but I would advise you to also give the fish a treat occasionally by giving them some earthworms or other live food.