totally in tanks I've had a fish in a tank and in a bowl and the tank ones lived longer
Yes, the bigger tank the better. They actually HATE goldfish bowls. (they're not nearly big enough). Goldfish usually need a 20 to 30 gallon tank
One can shop for goldfish bowls from many different stores and retailers. Some examples that sell goldfish bowls include PETCO, ThinkGeek, and Replacements.
fish tank
It is much better for the ifsh if you add a pump or filter in your tank.
No, it will not die, but don't be worried by your beta attacking a goldfish. Betas are usually only violent toward other betas, so your goldfish is safe. Also, I believe betas are tropical fish and goldfish are coldwater, but I have heard many sucess stories of betas surviving years in coldwater tanks and bowls. Best of luck
It ranges. They generally grow their whole life. The oldest goldfish lived to be 49 and I believe it was about 3 feet....The house hold goldfish lives between 10-20 (20 means you did great!) years and get about a foot long. They seem small as babies but rapidly grow and need large tanks. Small tanks and bowls stunt their growth and causes many problems besides how big they get. So to answer your question, they get big.
yes
Either an aquarium or a pond. NO BOWLS, PLEASE!
yes
As goldfish are coldwater fish, oxygen is not the main problem in their tanks (unless they are overstocked). Most fish enjoy having plants in their tanks as a place to hide and to add interest. However, goldfish will often eat the plants. An air pump on its own will not do much except giving your fish a stream of bubbles to play in. However, for an extra $10 or so you can add a filter to the end of the airline. The bubbles will draw water through the filter. This will be far more beneficial to the goldfish than anything else. I strongly recommend putting bio balls or bio rings in the filter to remove the fish's waste more effectively. Goldfish are not suitable fish for very small or unfiltered bowls or tanks.
Well, common goldfish can either live in a pond or home aquarium, its hard to answer precisely what you are asking because goldfish are not wild fish and don't really belong to a natural ecosystem.
No, fish can't hear.