If you want to reuse the old tank with dead fish, you must disinfect it first. Because the bacteria that cause the death of fish may still exist in the fish tank, and may be invaded by other bacteria at unused time, it is necessary to disinfect the fish tank for the sake of insurance. Disinfection usually uses potassium permanganate or chlorine dioxide, which is put into a fish tank filled with water, soaked for 3-4 hours, drained and cleaned several times.
After sterilizing the fish tank, the next step is to raise the water. It is best to prepare enough water a few days in advance, put it in the sun to dry, if it is just connected to the tap water, into the fish tank, can stand for a period of time, can also let the residual chlorine dissipate. Pay attention to the cultivation of bacteria in the water, pour nitrifying bacteria and fish food into the water, and then turn off the light for a period of time, so that it can establish a nitrification system.
When raising the water, the water in the fish tank will generally be muddy first and then clear. When it becomes clear, it means that the water is well raised. What you need to do at this time is to put the fish in the tank to test the water. There are many choices for tank fish, usually small fish, and easy to feed, if it is not easy to raise, if there is a problem, we do not know whether it is the problem of the tank. It usually takes half a month to test the water, if there is no problem in half a month, then put the fish you want to raise in the tank, otherwise you need to re-open the tank.
