Treatment methods for white frost on parrot fish:

1. Isolation treatment. When a parrot fish develops water mold or melon disease, the owner needs to take the fish out of the water and place it in a separate water for isolation treatment to prevent the disease from spreading to other healthy fish.

2. Medicinal bath. The owner can use 10% salt water or potassium permanganate plus a small amount of salt to give the parrot fish a medicated bath for about ten minutes each time. Let the fish soak four or five times a day until the white frost is completely eliminated.

3. Increase the water temperature. In order to enhance the resistance to rain and speed up metabolism, adjust the water temperature to between 28 degrees and 31 degrees.

Methods to prevent white frost on fish:

1. Clean the fish tank thoroughly and disinfect it with bleach.

2. Feed nutritious fish feed to improve the resistance of parrot fish.

3. Be gentle during daily operations and fishing, so as not to cause external injuries to the fish.

4. Ventilate the fish tank to get more sunlight, increase ultraviolet exposure, and maintain flowing water.