Discoloration, difficult breathing on the surface of the water, uncontrolled movements
Detergents in the cleaning bucket; excess fertilizer; Use of a phytosanitary product near the aquarium; Water from designing installations for conduits descaling.
Change of 4/5 of the water. Put water conditioner with protective gel of the mucous membranes. No food. Check the filter. Observe the fish well; The body's defenses being weakened, other diseases are possible.