The fish has black spots on its body, most likely because it was frightened and then had a stress response. This kind of situation is usually after the stimulation of strong light or loud noise, do not worry about the discovery of black spots, as long as the environment is kept quiet, to avoid it to continue to be stimulated, it will soon return to normal.
If the water quality is not good, the fish may also produce black spots, which is also a manifestation of stimulation. In view of this phenomenon, what we need to do is to change water as soon as possible, usually every week, about one fifth of each time, sometimes more, but not more than one third.
Black spot disease is a disease caused by parasites. The fish with the disease will become very thin and weak. At the same time, the color of the appearance is very ammoniacal. If the focus is in the gills, the fish will have difficulty breathing and often float on the surface of the water. The disease is caused by trichodinids, which can be treated with salt or potassium permanganate for 10-20 minutes.
Some fish in the discoloration period will also appear black spot, this is mainly due to the relationship between the growth environment, may be the problem of light, may also be too many black objects around, as long as the fish has no other performance, do not worry too much.
