If a fish is injured, it is necessary to change its water properly first, then raise the water temperature and add a little salt. Usually, the injury is not a big problem, but the wound may be infected, so we should do a good job of prevention. The purpose of changing water is to improve water quality, reduce the content of harmful bacteria in water and prevent them from invading wounds. Heating can promote metabolism and accelerate the recovery of fish. Adding salt increases osmotic pressure and prevents bacteria from invading.

1. Too much density: Fish get hurt usually because they are kept too densely. You can't raise too many fish. According to the size of the fish tank and the shape of the fish, you should control the number of fish to ensure that the fish have a certain space for movement, so as to avoid them rubbing against each other and prevent them from being injured.

2, Stone is too sharp: If there are some landscaping in the fish tank, we must pay attention not to use too sharp Stone, especially those with sharp points. It is best to check the fish after they are injured, and take out this kind of Stone to avoid other fish being injured. In addition, it is best to clean and disinfect Stone before entering the cylinder.

3. Mixed culture fights: Mixed culture fish has certain risks. Even fish with similar body shapes have a strong sense of territory. Once other fish are found approaching, they will fight fiercely, which will lead to fish injuries. After finding fish fighting, they must be isolated in time. If there is a fish that is eager to attack, it is best to keep it alone.