Unfortunately, many people don’t bother to find out about proper goldfish care, and think that goldfish can simply be kept in small, unfiltered bowls. It’s one of the biggest mistakes new goldfish keepers make.
The thing I often hear is that goldfish Only Grow to the Size of Their Enclosure. There is an element of truth to this, but it is not as innocent as it sounds and is related more to water quality than tank size. When properly cared for, goldfish will not stop growing. Most fishes are in fact what are known as indeterminate growers. This means that, unlike humans, they grow until they die. What really stunts a fish’s growth is poor water quality and improper care. In smaller aquariums or bowls, water quality is typically very poor. With little or no filtration and infrequent water changes, goldfish suffer. The stunting that results is not a good thing. Rather, it is a sign of ill health, and, frequently, stunted fish take on a deformed appearance and die at a young age
Goldfish need a big tank!
Why do goldfish need a big tank? It’s important to realize that the goldfish you buy in your local pet shop are very young and have not reached their full size. You might be surprised to know that common goldfish can reach up to 10″ and fancy goldfish can reach up to 8″, so you definitely need a big tank for them! one common goldfish needs a tank 4 feet long and a volume of at least 30 gallons. If you plan to keep more than one goldfish in your tank then add an extra 12 gallons for each additional fish.
It’s worth noting that common goldfish are often more suited to a pond once they grow larger in order to ensure that they have enough room to swim around. Very few people have an indoor aquarium large enough to properly keep a fully grown goldfish!
Finally, don’t forget that your goldfish tank needs a filter! Even a big tank will get polluted very quickly if it isn’t properly filteredor if you don’t do enough water changes . If possible, get an external filter, as they have a larger volume than internal filters, and sit outside your tank so that they don’t take up valuable space inside your aquarium.
Don’t let your fish suffer in a small tank, Team Shanklin pets