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Common Goldfish Tank Size

10K views 7 replies 8 participants last post by  Blue Ridge Reef  
Based on the tone of your post, I expect that you won't like the answers you'll get. IMO, a common goldfish can easily reach 10 or 11 inches and they are NOT slim-bodied. They need a 4-foot tank like a 40 gallon long or a 55 gallon at a minimum. The 30 to 40 gallons per fish, and 10 to 20 gallons for each additional fish info is about right.

If you have a 125, you can probably add 4, maybe 5 fish to it. However, there are other variables to consider. What type of filtration will you have? How often do you plan to do water changes? How much water will be changed each time? Goldfish have big appetites and produce a lot of waste.

Have you considered Paradise fish instead? :smile2::smile2: