1. A cold

Symptoms: black tongue hangs and loses spirit and appetite decreases. Body darkened. They do not like to swim and die within a few hours to a few days.

Treatment: ① Change the water and pay attention to temperature changes in winter to prevent excessive temperature changes. Can effectively prevent this disease.

②The sick black tongue can raise the temperature a few degrees and then recuperate with delicious food and good hospitality.

2. Bubble disease

Symptoms : The black tongue hangs on the body surface (especially the tail fin), the gills, and the intestines are full of air bubbles, the body is unbalanced, the tail floats on the water surface, and cannot eat. Occurs in the high temperature season of late spring and summer.

Treatment: ① Sunshade should be paid attention to in high temperature season. Keep water fresh. Can effectively prevent this disease.

②The black tongue hanging can be transferred to water for about a day.

③Use an air pump to drive out the supersaturated oxygen in the water.