If it is a fish tank for freshwater fish, it is generally not necessary to add salt. If it is a sea water tank, it is usually necessary to add salt after changing the water.Salt can change the osmotic pressure of water, which will change the movement of water, the original osmotic pressure of fresh water is lower than that of fish, so water will continue to infiltrate, fish need to expel excess water.If too much salt is added, the osmotic pressure of the salt water is relatively high, and water will seep out of the fish, which will affect its health.
1. 0.5%: Usually, it is enough to add salt to freshwater fish with a salinity of five thousandths. If it is safe, three thousandths is enough.This salinity does not affect the fish too much, so it can be directly into the tank, usually in the early stage of the disease is more commonly used to prevent bacterial invasion, but also to reduce the burden on the kidneys.
2. 1%: If the fish is disinfected and treated, the concentration of five thousandths is not enough. At this time, 1% salt water should be used to soak the fish.This kind of brine concentration is on the high side, the soaking time can not be too long, generally 5-10 minutes is better, and need to use a special container bubble, can not put salt into the jar.
3, 3%: 3% concentration of salt water on the fish has a certain degree of lethality, so not the last resort, do not easily use this salt water bubble fish, and the bubble time can not be long, a few seconds is enough, when the bubble should also pay attention to observation, if there is any abnormality, it should be immediately fished out.
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