Can you keep goldfish without oxygen generator and filter?

If the average goldfish is not too big and the number is not too much, the four goldfish you mentioned can be used without aeration and filtration, but as long as the water is changed once every two or three days, 30% to 40% of the water can be used. It's best to pump fish manure out of the bottom of the water with a small tube, otherwise it will be dirty. \ x0d \ It is a good idea to increase the oxygen in the water, which is also an important step for feeding goldfish. Increasing oxygen in water by raising some aquatic plants can only be achieved under the condition of sufficient light. If your fish tank doesn't have enough light (illumination) to illuminate plants, aquatic plants will not only not release oxygen, but also absorb oxygen and release carbon dioxide, which will not only make goldfish enjoy more oxygen, but also do no harm to water quality. Aquatic plants will also fail and die, because without enough light, they can't produce the nutrients they need. For example, besides raising aquatic plants in water, there are many ways to increase oxygen and reduce consumption. If possible, buy a strainer, which can both filter and aerate, killing two birds with one stone. At present, most filters have their own oxygenation system. \x0d\ The fish you just bought will die for many reasons. Everyone who raises fish for the first time has the experience of dead fish. Generally speaking, goldfish can be raised well as long as it is carefully raised, properly managed, with fresh bait, fixed quality, quantitative and regular feeding, attention to stocking density, control of water temperature changes and good water quality. \x0d\\x0d\ Here are some tips for keeping goldfish well. I have told many friends who are deeply puzzled by the death and illness of goldfish. Maybe you've seen it before, and now I'll give it to you for reference. \x0d\x0d\ First of all, you should learn how to buy good fish and how to choose healthy goldfish \ x0d \ Healthy fish swim in the middle and lower water, foraging and competing for food, swimming naturally and leisurely, living in groups with other fish, and the tail fin is clear, transparent and elegant. If you swim with your head down, floating and struggling, you can't buy sick fish with trauma, white hair and white spots, thick tail fins, cloudy eyes, dim body color and loneliness. \ x0d \ x0d \ Second, after the goldfish is bought back, don't rush into the tank. Put the plastic bag containing fish in the fish tank 10 to 20 minutes before opening it. Let the water in the tank flow back into the bag for many times and gradually mix with the original water in the bag, so that the fish can gradually adapt to the water temperature and quality. If there is a light, turn it off. In the dark, fish are quiet and not easily frightened. \x0d\\x0d\ 3 cannot change the temperature of water sharply. Goldfish can live in a wide temperature range and can still live under ice in winter. As long as they are not exposed to the sun, they can live normally in hot weather, but if the temperature changes sharply, they will get sick or die. Even when buying fish, pay attention to the water temperature of the aquarium and the water temperature of your own aquarium. The deviation should not be too big, generally within 4 degrees is allowed. \x0d\\x0d\ 4 Don't change too much water at a time, or the water quality will suddenly change too much, resulting in discomfort. Water quality includes pH value, hardness, residual chlorine, dissolved oxygen, nitrate, sulfide, protein and turbidity. Goldfish has adapted to the original water quality life and suddenly changed the water quality. Goldfish can't adapt and get sick or even die suddenly. Therefore, the fresh water used to change water for goldfish must be stored for a day or two. This is called dry water. On the one hand, the purpose of dry water is to remove some chlorine in water, and on the other hand, it is mainly to make the temperature of new water and old water close. \ x0d \ x0d \ Fifth, pay attention to the density of fish. Novices often buy the fish they like when they see it, and seldom care about how many fish can be raised in the tank. Even if they ask the fishmonger for advice for profit, can they ask you to buy less? In my experience, it takes at least 3 liters of water to raise fish with a length of 1 cm. If your fish tank is filled with 100 liter of water, you can feed 3 fish with 10 cm and 8 fish with 5 ~ 6 cm (relatively narrow). Goldfish are more active in a larger space, and their body color is more vivid. Too high density can easily lead to lack of oxygen in water, deterioration of water quality, and illness and death of goldfish. \ x0d \ x0d \ 6 How to feed. Take it once or twice a day within 5 to 10 minutes. Feed less in rainy days and not at night. Fish need to consume more oxygen when digesting food. On rainy days and nights, the air pressure is low, so the dissolved oxygen in the water is low. In this case, feeding the fish may lead to serious hypoxia in the water and kill the fish. Most dead fish occur at night, mainly due to severe hypoxia in the water. According to the color of fish manure, we can distinguish the saturated digestion and absorption of goldfish hunger: if the fish manure is green, brown or black, it means that the fish is suitable for feeding and absorbs well. If the fish manure is white, it means that the fish is full. \ x0d \ x0d \ 7 The bait must be clean. Feeding unclean fish food can easily lead to fish diseases. Although goldfish like live food best, goldfish who eat live food grow faster. However, live food grows in polluted water environment, which is very easy to pollute germs, so be careful when releasing live food. It is recommended to buy brand-name frozen fresh foods produced by professional companies, such as red worms and bumper shrimp, supplemented by beans and vegetables, to maintain comprehensive nutrition. Breadform is also goldfish's favorite live bait and can also be fed. \ x0d \ x0d \ 8 Keep the water clean. Goldfish eat a lot, consume a lot of oxygen and discharge a lot of waste, which will pollute the water and breed germs. In order to keep the water clean, it is necessary to install a filter, remove the wrinkles and residual bait at the bottom of the pool every day, and replace one tenth of the old water, especially in summer. It is best to use filtration with aeration design, so that filtration and aeration can be carried out at the same time, which not only purifies the water body but also supplements oxygen. \x0d\\x0d\ 9 Do not bring oil into the water. Oil pollution will float on the water surface to isolate the air, so that the oxygen in the water can not be replenished, leading to the death of goldfish due to lack of oxygen. Eating meat or applying hand cream on your hands will bring oil into the water and should be carefully avoided. \x0d\\x0d\ 10 It is best to start with cultured goldfish. China goldfish have strong foraging ability and strong physique, and are not easily injured by accidents. We can start by raising goldfish in China.