White spot disease. The whole body of the elephant trunk fish seems to be covered with a white film, with increased mucus, dull body color, thin body, loss of vitality, slow swimming, and often sluggishness. Or floating on the water, or living in a group, loss of appetite, accompanied by bleeding spots on the body, and likes to rub and itch on aquatic plants, fish tanks, etc.

You can sprinkle 5-8 thousandths of table salt into the tank, And raise the temperature to above 28. Or use two parts per million (2ppm) methyl blue solution, soak for 6 hours a day.