I have 2 goldfish in a 10 gal. aquarium. One is a 2 year old Pom-pom Goldfish and the other is a 6 year old Calico goldfish. I was just wondering how big do they get and I wanted to get them a 16 gal. and my mom said they grow to the size of their tank, is this true?


My Pom-Pom is about 4 inch and My calico is a little over 3 inch


My parents were thinking about a pond in the summer since we just got rid of our swing set. I also have a 25 ga. long but I have lots of other fish in it.

I don't really have room for another tank because my mom dosn't want are hose to have fish tanks all over the place. I have a 55 gal. which is my biggest but it is taken with 8 hermit crabs (3 big, 5 small) And they wouldn't be together if I had to use their old homes. Or else I'd move all my fish in my 25 to my 55 and move my goldfish to my 25 and get more little fish for my 10. I also have 2 other 10gal. aquriums and a 2.77 gal. but I don't want to separate them.

The myth that they grow to the size of their tank is just that, a myth. The fish puts out a hormone that tells it to slow down as it grows, so that it can adapt better to the surroundings. There have been tests done on betta, and there was a betta that was over 4 inches long from daily water changes!

Its a good idea to get a larger tank, but I would go with a 20 long or a 30gal tank, because goldfish are supposed to have 50gals of water since they are so messy and (no offense) gross. Yours sound like they've been well taken care of, so I would say a 30gal would be ok for the two of them. You could also try doing an outdoor pond, but thats a big chore.

Most goldfish are supposed to grow to be around a foot in length, also, your (jack) goldfish are probably horribly stunted which is very cruel to the fish, and I'd recommend upgrading to a 20 gallon long.