Earthworms and baby fish
many fish are tiny so there are lots of species of "tiny fish." different types of fish need different foods. bettas need a special betta food, some brands come in fakes. goldfish need goldfish flakes. and tropical fish like tetras, barbs, danios, glofish, guppies and angelfish need tropical fish flakes. piranahs like dead goldfish, so if you have a goldfish and a pirannah and the goldfish dies before the pirranah you could feed the goldfish to the piranah. oher kinds of fish like different things. most fish that live in ponds can get their food by fining it at the bottom of the pond so you don't need to feed them very much. if this doesn't help you should ask somebody who works at a pet store what you should feed your "tiny fish."
Yes, In general coldwater fish like goldfish are more hardy(harder to kill) than tropical fish. Saltwater fish are very easy to kill if you don't know what you are doing. Goldfish are very hardy fish that you can't kill easily. It is best to start out with fish like goldfish because you can make mistakes with them that would kill other fish. So goldfish are fish that does not die easily.
yes they eat large meaty foods like small pieces of fish, squid, shrimp, and live goldfish.
Goldfish are best kept with other goldfish or similar coldwater species that can tolerate cooler temperatures and shared tank requirements. Good tankmates for goldfish include white cloud mountain minnows, dojo loaches, weather loaches, and rosy barbs. Avoid fish that may outcompete goldfish for food or nip at their fins, such as tropical fish like angelfish or neon tetras.
Goldfish.
Most people feed goldfish fish flakes or pellets. This is fine, as they are filled with nutrients, but fish need variety in their diet like humans. You can feed them peas, lettuce, cucumber, and other vegetables.
Goldfish have a backbone, like all fish, which does indeed make them invertabrates.
No, they can not. Fantails are goldfish and goldfish like temperature from 63-750 . And no goldfish can not be with any tropical fish. It can only be with other goldfish they are likely to nip a little to pick on who's weak but it is not a problem.
Koi
If you don't have fish food, you can feed a goldfish boiled vegetables like peas or zucchini, or small amounts of cooked rice. Avoid feeding them bread or other processed foods as they may not provide the necessary nutrients for your goldfish's health. It's important to get proper fish food as soon as possible for a balanced diet.
They prefer foods like shrimp pellets or various vegetables but will also eat tropical fish food, regular fish food, algae wafers, and even small fish that can be captured by their claws, such as goldfish or minnows
They are just like you and I. What goes in is processed by their digestive system and what is not used is passed out. If you are feeding the fish heaps of roughage then it will pass out more poo. If you are feeding the fish good stuff like earthworms then the fish will grow faster and poo less because there is less rubbish and more goodness in foods like earthworms.