A goldfish is a cold water fish, so it does best when it is in cooler water. Any goldfish forced to live in a tropical fish setting will probably live, just like you can live outside when it's very hot in the summer, but it will not be the healthiest, happiest goldfish it can be, just like you would rather be in the air conditioning.
Goldfish may be kept in an uheated fresh-water aquarium. They are considered ill-suited to live in a heated tropical fish tank, as they are used to the greater amount of oxygen in unheated tanks.
shouldn't be a problem because they live in both
If the goldfish is a fancy variety, it can live alone in a 20 gallon tank. Goldfish do not belong in tanks any smaller than this as they grow very large
they are found in collection tanks around the world but originally found in China
Probably, but usually the comet goldfish will get all the food and/or the other goldfish will become miserable. This has happened to me before and I do not recommend putting them in the same tanks. Try putting the fancy and comet godlfish seperate!
yes
yes
goldfish do not live on land
The goldfish tank size myth suggests that goldfish can live in small tanks, but the truth is that they need a lot of space to thrive. Goldfish produce a lot of waste and need room to swim and grow properly. It is recommended to provide at least 20 gallons of water per goldfish to ensure their health and well-being.
No, fish can't hear.
totally in tanks I've had a fish in a tank and in a bowl and the tank ones lived longer
Three in a bowl? To live its full lifespan a goldfish needs ten gallons, so if you want three, you need to have a 30 gallon tank. Or 3 individual 10 gallon tanks. Otherwise they will live a month, maybe.