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It isn't just about if it grows large or not, it's about the bio-load of the fish and a goldfish are very messy so their bio load is very large. Do you know the Nitrogen Cycle? If not, find out by clicking the blue words. Each fish needs enough space for waste dilution and if these limits aren't respected then it'll be very hard to maintain good water quality.Hamham said:yes I agree with you all! But the type of goldfish I'm getting from the store says it only grows to 6". So if I have a 20 gallon tank how many of those can I put in?