Common Goldfish (single-tail)
Carassius auratus
The Common Goldfish (single-tail) (Carassius auratus) is a peaceful fish that's a good step up once you have a little experience. Give it a tank of at least 180 litres (48 US gallons), water held at 50-72°F, and a pH of 6.5-8.
Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
East Asia
- East & Southeast Asia
Regional colours match the stocking calculator's origin map.
Common Goldfish (single-tail) Tank Setup
Goldfish need at least 180 litres (48 US gallons) with powerful filtration and cooler water around 50-72°F, pH 6.5-8. They produce far more waste than most tropical fish, so don't skimp on the filter. They grow to around 30 cm, so plan the tank size and filtration for a full-grown adult rather than the small juvenile you see in the shop.
What Do Common Goldfish Eat?
They're not fussy eaters - feed a varied diet, rotating good-quality dry, frozen, and gel foods rather than the same thing every day, and match the food size to their mouths.
Common Goldfish (single-tail) Tank Mates
Very high waste; needs strong filtration and lots of swimming length The Common Goldfish (single-tail) is peaceful, which is the first thing to weigh up when you choose tank mates. At around 30 cm fully grown, it needs tank mates that can hold their own against its size and appetite. Before you buy, run your full stocking list through our stocking calculator. It weighs temperament, adult size, and water needs together, which a single species page can't do on its own.
Are Common Goldfish Good for Beginners?
Doable once you test water regularly and catch problems before fish look sick. If this is your first tank, pick something more forgiving and come back later.
Common Goldfish (single-tail) - frequently asked questions
What size tank do Common Goldfish need?
Common Goldfish need a tank of at least 180 litres (48 US gallons). A bigger tank is always easier to keep stable, and gives them more room to settle in and behave naturally.
What water parameters do Common Goldfish need?
Keep them at 50-72°F with a pH of 6.5-8, steady rather than chased to an exact figure. In a cycled tank, ammonia and nitrite should both read 0 ppm, with nitrate kept low through regular water changes.
What do Common Goldfish eat?
Common Goldfish are omnivores and aren't fussy eaters. Feed a varied mix of good-quality dry, frozen, and gel foods, and match the food size to their mouths. Feed small amounts once or twice a day, and remove anything they don't eat.
Are Common Goldfish good for beginners?
Common Goldfish are best for keepers with a little experience. They are manageable once you test water regularly and catch problems early; a complete beginner may prefer something more forgiving first.
Common mistakes with Common Goldfish
- Underestimating tank size - the minimum footprint is 180 litres (48 US gallons); impulse buying into a smaller tank leads to stress and shortened lifespan.
Building a community? Run the full list through the stocking calculator before you add anything else.
Great tank mates
Chosen from temperament, overlapping temperature/pH bands, plausible minimum tank footprints, and size versus yours in App-aquatic data. Hobby nuance always wins - verify stocking and temperament before purchasing.
Fish to avoid mixing with Common Goldfish
These well-known species are commonly sold alongside this fish but are not recommended tank mates - verify before purchasing.
- OscarTropical fish - too warm for goldfish tanks
- AxolotlTropical fish - too warm for goldfish tanks
- Crescent BettaTropical fish - too warm for goldfish tanks
