How do I know when my goldfish needs a bigger tank?

Question

I have two goldfish one is small and the other is 10cm (4inches). The bigger one is swimming around the tank very fast and is bashing into everything. Do I need I bigger tank? Or is he just having a wild moment? Thanks! :-)

Answer 1

Without asking any other questions, I'd say that the fish ARE overcrowded. I had a 11litre tank with two goldfish, and they would race around the side of the tank, then freeze, then race around. Then, when I moved them to a 35litre tank, they quickly resumed normal behaviour.

If I were you, I'd purchase a larger tank (remember - 10gallons per fish). Your larger fish could get injured in its racing around.

Just as a double check, do a good 45% water change and see if it helps. If a water change doesn't help, get as large as a tank as your budget will allow.

Good luck and happy fishkeeping

Answer 2

question to ask

1)how big is your current tank please then we can help you out on whether you need a bigger tank or not

Answer 3

Well how big is your tank?!?!