How to care for a goldfish in the aquarium?

Goldfish have long been adopted to entertain children. Left in a small round jar, this little animal suffered from this false image of a companion of little value. If it is a cold water fish that is relatively easy to care for, the goldfish has needs, starting with a well-sized aquarium, quality water and a diet adapted to its stomach, which is quite greedy for its well-being. . Discover our tips for raising your goldfish in the best possible conditions.

The goldfish: who is it?

The famous red fish (Carassius auratus) is a freshwater fish belonging to the large family Cyprinidae. Easy to breed and feed, it has long suffered from its image as a trashy fish capable of eating anything and put in any kind of jar. Fortunately, nowadays, sellers of these small fish are now more concerned with informing consumers and individuals are generally more attentive in respecting their needs.

Moreover, the goldfish is considered a domestic animal under article L. 214 of the Rural Code. As a result, it is protected by law and fines can be applied if it is sold or grown in inappropriate conditions.

In the wild, goldfish are actually gray to golden in color. If the individuals we have observed in stores are decorated with a beautiful scarlet color, this is quite simply the result of selections made within farms for centuries. In fact, it was the Chinese emperors who began to take an interest in these small fish and breed them in large lakes.

Yes, of course! Because goldfish are actually fish that should live in garden ponds to thrive naturally. The individuals we adopt from pet stores are small because of their container and they are often kept in aquariums that are too small to allow them to thrive easily. However, the reality of living in these very confined spaces hinders their growth and can harm their well-being. So, the goldfish is an animal that usually has a life span of 30 years and can reach 25 to 30 cm in length. But in our aquariums, this is utopia, although it is possible to achieve a long life of 10 to 15 years in good breeding conditions.

We are talking about goldfish, but we must refer to them in the plural, because they are nasty animals that are used to living in schools. In fact, an individual cannot live alone and needs at least one companion, above all, regardless of gender. On the other hand, it is better not to mix the species too much in order to more easily meet the specific needs of the goldfish in terms of food and environment.

The perfect goldfish aquarium

Goldfish are the most sold, especially among beginners in aquariums. This is explained by its low price and the fact that its needs are not demanding. Originally a pond fish, it tolerates cold water well and requires little equipment.

The size of the aquarium

This little animal is not very picky. Goldfish, on the other hand, need space. By nature, as we have indicated, it lives in schools. Therefore, it will be necessary to adopt at least two individuals and raise them together. So for a couple, it is necessary to provide an aquarium with a minimum volume of 100 liters. This is the minimum measure to enable them to develop as much as possible and live in the best possible conditions. For each additional individual, ideally it is necessary to add 50 liters of capacity.

Aquarium accessories

We have forgotten the simple jar idea that has long been associated with goldfish. For the animal to live in good conditions, it needs an aquarium that properly meets its needs. Therefore, it must be equipped with the following accessories:

  • a quality filter to remove the dirt that contaminates the water and maintains its purity;
  • a landing net to remove large debris that the filter cannot capture;
  • a light respect the natural cycles of day and night and for the well-being of plants;
  • plant are not obligatory, but they make it possible to decorate the space in a more natural way and to reduce the anxiety of the goldfish that can hide there and rest there;
  • a bubbler to oxygenate the water if you have little or no real plants;
  • good bacteria often sold as a liquid to pour into water to help balance the water in the aquarium;
  • squeegee or magnet to clean windows and remove algae;
  • gravel in sufficient quantity to cover the bottom 3 to 4 centimeters high and preferably round in shape so as not to injure the residents.

Aquarium water

If the goldfish is a cold water animal, the water in the aquarium should ideally be kept between 18 and 22°C. For this reason, it is not useful to put a heater on the container and it is necessary to avoid too strong light that risks heating the water as well as the proximity of a radiator, window or direct sunlight.

The pH level of the water should be neutral, meaning between 7 and 8 and the hardness level between 5 and 9 GH. These data are easily and routinely measured using test kits sold in pet stores.

How to introduce goldfish to their new aquarium?

It goes without saying that the aquarium must be prepared for the arrival of your goldfish. Do not buy the whole thing at once, because you will cause too much stress which can lead to premature death of the fish. In addition, an aquarium is a very fragile balance that can only be regulated after a few weeks of starting without residents. Ideally, prepare your aquarium and let it be empty for three to four weeks before putting in your first fish so that the good bacteria can settle in and prepare the space.

Once you have purchased your goldfish, leave them alone in their bag containing water from their original aquarium. Turn off your aquarium lights to avoid stressing them and place the bags on top. Let them float this way for 30 minutes to 1 hour, to allow them to properly adapt to the temperature difference between their old and their new space.

Then make small notches in the bags to allow the aquarium water to seep through. Your fish will be able, within 30 minutes to 1 hour again, to gradually get used to their new water.

It is time to allow them to move into their new environment. To do this, avoid throwing the contents of the bag into the aquarium, because if the water in the pet store is contaminated with bacteria, they will grow in your tank. Instead, use your landing net to gently move your fish to their new space.

Wait a few minutes then turn on the light.

You do the same whenever you add one or more new residents to your aquarium.

Remember to renew about a third of the water every week and check the pH level regularly. You will also need to rinse the filter regularly to allow the good bacteria to grow while removing impurities.

How to feed a goldfish in the aquarium?

Goldfish have a reputation for eating anything and everything, but this misconception should not be trusted, as they can become seriously ill and kill them. These small fish need to be fed once or twice a day, in small quantities.

Avoid overfeeding your fish, as they may die. Better to give them a small ration each time.

Purchase bottles specially designed for goldfish at pet stores. Avoid taking a product made for other types of fish. Thus you can find food in the form of grains or flakes, which are freeze-dried, which are better soaked in a bowl of water before giving them to avoid inflammation in the animal’s stomach. You can also offer them mosquito larvae, freeze-dried bloodworms or live brine shrimp occasionally.

It is best to feed your fish once in the morning and once in the evening at the same time each day, and in the same place. Only feed the minimum, which is what the goldfish can eat in one minute. Any debris must be removed so that the animals do not overeat to the point of overloading their stomachs and perishing.

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