- If the goldfish is a small to medium-sized COMMON goldfish, the absolute minimum tank size is 35 gallons. However, if the goldfish is medium to large-sized, or even larger, the fish may require a minimum tank size of 55+ gallons.
- Goldfish are often marketed as easy, low-maintenance pets, but one of the most common mistakes new owners make is underestimating how much space they need. A small bowl or undersized aquarium may seem fine at first, but inadequate tank size can lead to poor water quality, stunted growth, stress, and a dramatically shortened lifespan.
- Goldfish are very messy fish and ... ... A bowl is all you need what the ****. ... Yea, actually it's 10-20 gallon minimum per fish with filtration....
These problems both shorten a ... tank sizes for keeping goldfish: Common Goldfish: 40 gallons (48 US gallons, 180 litres) for the first fish with an extra 12 gallons (14 US gallons, 55 litres) for each extra fish....
Answer (1 of 2): A common goldfish needs a minimum of a 20-gallon tank for one fish, with an additional 10 gallons for each extra fish.
- As the fish grow, expect to upgrade to a 50, 75, or even 100-gallon tank for one goldfish. Standard comet goldfish can grow up to 16 inches longthe same size as a dinner plateand they will need lots of room to swim.
