1. after the fish tank puts the yellow powder salt how long to change the water

, after the fish tank puts the yellow powder salt, generally 24 hours must change the water. The main function of yellow powder is to sterilize and disinfect. It can play a preventive role when it is not sick. It can cure diseases when it is sick, but it is not a cure-all. With this medicine, you can pour it into the fish tank, or you can prepare a special medicine bathtub. The amount of water poured into the fish tank should not be too large, and the water should be changed later, so the medicine bathtub is not so troublesome.

Hemorrhagic disease: Hemorrhagic disease is a common fish disease. After the disease, some parts of the body will begin to bleed. The sick fish will swim slowly, and do not eat feed, or even die in large numbers. There are many reasons for the occurrence of this disease, which may be due to poor water quality or the stimulation of temperature changes.

2. Head hole disease: Head hole disease is usually caused by fish lacking specific nutrition or being infected by parasites. During the treatment period, besides keeping the water changed, calcium carbonate and magnesium sulfide should be added to the water, and certain nutrients should be provided in the food, so that the fish can grow healthily.

3. Fin rot disease: Fin rot disease is usually caused by poor water quality. At the beginning of the disease, the edge of the fin will become opaque, then the membrane will fall off, the fin spine will be exposed and split, and then the fish will die. If you want treatment, you must pay attention to changing water and warming up, and at the same time use some antibiotics and other drugs.