* Size: Goldfish can grow to be much larger than feeder fish. Some goldfish varieties can reach lengths of over 12 inches, while feeder fish typically only grow to be about 2 inches long.
* Lifespan: Goldfish can live for much longer than feeder fish. Some goldfish have been known to live for over 20 years, while feeder fish typically only live for a few months.
* Diet: Goldfish are omnivores and will eat a variety of foods, including flakes, pellets, and live food. Feeder fish are carnivores and will only eat live food.
* Water quality: Goldfish are more sensitive to water quality than feeder fish. They require clean, well-oxygenated water with a pH level between 6.5 and 8.0. Feeder fish are more tolerant of poor water quality and can survive in a wider range of pH levels.
* Temperament: Goldfish are generally peaceful fish that will get along with other fish and invertebrates. Feeder fish can be aggressive towards each other and may even eat other fish.
In general, goldfish are better suited for aquariums than feeder fish. They are more hardy, live longer, and are more peaceful. Feeder fish are best used as food for larger fish, such as Oscars and cichlids.