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My fan-tailed goldfish, Ophelia, has lived for 6 months in a two gallon tank and...


My fan-tailed goldfish, Ophelia, has lived for 6 months in a two gallon tank and was recently transferred to a 1.5 gallon tank. On your website it says she needs a tank of 29 gallons, but she has been fine in the two and 1.5 gallon tanks so far. Does she really need 29 gallons, or is that just for if you have a lot more fish?

The general rule is one inch of fish body length per gallon of water. So a one-gallon aquarium could theoretically only hold one fish that is 1" long.


23 Jan 2011 4:48 pm

BeavisMom62 said:

GOldfish really DO need at least 20 gal per fish! A fan tail can get to 8" long and live 10 years or more if properly cared for. You've only had her for six months. She needs room to grow and swim around and needs fresh, clean, filtered water which is tested weekly with partial water changes at least weekly as well. Goldfish are messy and it doesn't take much for ammonia levels to sky rocket in a tiny tank.

The one inch rule has exceptions of course, depending on the type of fish. It mostly applies to smaller, streamlined fish such as tetras and guppies. Goldies are full bodied fish. If the 1" rule applied across the board, then you could keep a 10" Oscar in a ten gal tank!

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