What Size Fish Tank Do I Need for 2 Goldfish

Based on the rules above, the goldfish tank size we recommend for two goldfish is: 42 gallons for two Common goldfish. That’s 30 gallons for the first fish and 12 additional gallons for the second fish. 30 gallons for two fancy goldfish.

Is a 10 gallon tank big enough for 2 goldfish?

Can two Goldfish live in a 10-gallon tank? Two fully grown goldfish would hardly be able to move in a 10-gallon tank. You can keep two only when they are as small as babies. Once they go beyond 2.5 inches each, you need to transfer them to a larger aquarium if you want them to grow healthy and happy.

Can 2 goldfish live in a 3.5 gallon tank?

Absolutely not. Even a ten gallon tank would be too small for a goldfish. Goldfish grow much larger than you think they do, and they produce a lot of waste for their size. A 3.5 gallon tank is too small for almost any fish, and is much too small for a goldfish.