Yes they can .
Don't listen to any one They will be wrong!
No. A 10 gallon tank is barely big enough to keep a single goldfish in.
yes
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
Goldfish commonly grow to over 12 inches. The size of your tank would indicate that it is not really large enough for keeping goldfish in. The basic rule of fishkeeping is "1 Inch of fish needs a minimum of 1 gallon of water. Goldfish should really be kept in a pond.
I have a 10gallon with a common and a shubunkin goldfish. They are both around 2.5 inches. I am soon upgrading to a 30 gallon so there will be enough room when they get bigger.
Absolutely not! Unless the goldfish is half an inch and going to stay that way you are seriously hurting your fish! A comet goldfish will get very big! you need at least a 55 gallon tank for that sucker! Try raising a smaller regular goldfish in a 20 gallon tank. You'd be far better off!
Yes, but only just. Please make sure the tank is properly filtered and has a regular weekly part water change.
For twenty small (1-1.5 inch) Goldfish you should have something like a 30 gallon aquarium.
about 10 or 15 depends on how big they are
it depends on how big it is if it is a goldfish or beta it can be in a bowl.If it is one of those big tiger fish or aqarium fish then put it in a big tank. A fish will grow to the size of the tank or bowl. For instance, say a goldfish is in a tank, it will not grow as big as the tank; however it will grow big enough to be able to swim in their environment. The fish will not overgrow the tank. I had a six inch goldfish in a thirty gallon tank.
No you schould not have that many fish in a one gallon tank. Thats the size of a big betta bowl. And because they are goldfish it is worse their poops are toxins
No, a 10-gallon tank is not big enough for a hamster. Hamsters require a minimum of 360 square inches of floor space, which is typically not provided by a 10-gallon tank. It is recommended to provide a larger enclosure for the well-being of the hamster.