no other wise it cant get the magic sparkles it needs from the water
Yes. A goldfish can live without a filter. They may not live as long, but they do not have to have a filter, or a heater. I had goldfish in a five gallon tank without a filter for a long time. Hope that this helps.
Yes, can they live without air pump?
No, goldfish should only live with goldfish with a few small exceptions that do not include red ear sliders.
Change its water every day.
Up to 1 to 2 hours
Well, considering that goldfish do not breathe air, they can live without it for as long as their normal lifespan might happen to be. Some goldfish only life for up to about a year and a half, while others can life for as long as 25 years or more. All without taking a single breath of air.
goldfish do not live on land
Sure. You can put a goldfish in anything that can hold liquid. But the best thing to do is to put it in a tank with a pump so it gets oxygen. I don't recommend leaving a goldfish in a cup for a long period of time.
Many things can live/survive for a while in terrible conditions.The goldfish you describe are living in spite of the terrible conditions and will inevitably become sick and then die eventually.
Goldfish can live in temperatures of 10 to 30 degrees Celsius. Room temperature is also good for goldfish to live in.
Your goldfish will not live "longer" no matter how many or how few you have.
For househeld goldfish, they generally live 6-8 years