Changing water is not a strange thing for fish farming, because the water quality of the fish tank will be aging, so it is necessary to change water regularly to keep the water quality clear, but also helpful to the health of the fish. However, if the fish is sick, the cycle of changing water will be greatly shortened, because there are too many bacteria and parasites in the tank, which need to be discharged by changing water, basically every other day.
If you raise tropical fish, you must control the temperature of the water body at ordinary times, and there are not too many requirements for fish with a wide range of temperatures. But whether it's tropical fish or eurythermal fish, warming can have the same effect. That is to stimulate the metabolism of the fish and improve its resistance. Therefore, the temperature can not rise too high, compared with the original water temperature, 1-2 degrees Celsius rise is enough, like tropical fish, can be maintained at about 28-30 degrees Celsius.
The last step of the old three is salt. The salt here is usually coarse salt, and salt without iodine can also be used. The purpose of salt is not to kill bacteria, because the general salinity is only three or five thousandths, this concentration of salt water is not bactericidal, its main role is to change the osmotic pressure of water. Because the osmotic pressure of freshwater fish is relatively high, water will flow from the outside to the fish, so the fish must be drained all the time. After salt is added, the osmotic pressure of water increases, which can reduce the kidney burden of fish and inhibit bacteria from invading fish with water.
