Koi fish crashed into the cylinder for no reason, like crazy. He still has some convulsions while playing, and his mouth is swollen. Do you have any ideas?

There are many reasons why fish hit the tank, and the moderator really said it. When the fish is frightened, it will collide with the water tank. Of course, this is not the only reason for the cylinder collision.

1, the fish are scared, especially the new fish.

Great changes have taken place in the environment. For example, a large number of water changes, cleaning fish tanks and so on. There is also an adaptation process for new fish to go home.

The water quality is getting worse and worse. The ammonia content in water is too high to be decomposed by nitrifying bacteria in time.

4. Personal reasons. Some fish are too timid to train.