Carps are omnivores and eat both insects and plant matter. There are species specific pelleted foods that you can get from your LFS.
What kind of goldfish food? If it's fish flakes then definitely! I'm pretty sure you can feed any fish any fish food as long as it's not too big for the fish to actually eat or spiked with poison;)
Small insects like pinhead crickets may suffice, but fish food is recommended.
even smaller fish, but however if it is a pet fish then talk to your local pet store for what to feed your fish.
You would kill the fish by poluting the water if you added any kind of sauce to the water. The fish will survive a day or two without food until you can get some proper food for it/them.
That depends on what kind of fish you have. Some people feel dry food, other prefer frozen food such as mysis shrimp. Some marine fish, such as tangs, eat plants. Many feed them dried nori.
Different species of fish have different food requirements. Tropical Flakes are designed to feed a mix of tropical fish species. Goldfish food is a product that has been produced specifically to supply all the dietary needs of a goldfish. So yes goldfish can eat whatever you give them including Tropical fish food but it will not neccessarilly be doing the fish much good though.
It depends on how many fish you have, and the size of the fish. Usually, whatever your fish can consume in 5 minutes is how much they can eat. Mine is one of those oval goldfish, not the roundish kind with the flashy fins. I feed it one pellet twice a day.
Mitchell feeds Skellig fish heads to help him regain his strength.
Lice feed on human blood, not on food like insects. They use their mouthparts to bite the scalp and feed on blood several times a day.
chips
non vegetarian food
just give goldfish food