1, air in advance: No matter how to change water, also must treat water before changing. Most of the water used in fish farming comes from tap water. Although this kind of water is very safe, the chlorine in it is harmful to fish, so it is necessary to put them in a sunny place for a day or two after they are connected, and then use them after the chlorine is volatilized.
2. Pump out the old water: Do not use the water pump to pump out the old water. Not only can you not control the amount, but also the noise will frighten the fish. So, the easiest way is to find a tube and siphon the water.
3. Add new water: suck out one fifth, and then add new water. And put the trapped water into the fish tank, slowly pour it from the wall of the tank, because pouring it at once will produce a larger flow of water, causing damage to the fish. Fish tanks with better water quality can change water once a week, and fish tanks with filtration devices can change water once a half month. If the water quality is poor, it will be changed every three days.
in the big fish tank? 1. Drying the water in advance: Pour the new water into the big basin and put it in the sun to dry. This is to remove chlorine.
2. Frequency of water change: Change the water once every one to two weeks. If the water is clear, you don't need to change the water frequently. The amount of water changed is basically between one quarter and one third.
3. Pump water and add water: pump water with a water pump and suck water by siphon method. Then pour the new water into the fish tank.
4. Precautions: Pay attention to the water temperature. The water temperature difference between the new water and the old water is too big, which will make the fish not adapt or even die. Generally, the temperature of new water is 1-2 ℃ higher than that of old water, and the water temperature should be as consistent as possible before and after water change.
