Fish shows an excess of mucous, the skin becomes inflamed and the gills may bleed and deteriorate. Fish may also display darting movement and may jump in an attempt to leave the water. Fish also shows signs of increased respiration and can be seen gasping for air at the water surface.
Cause:
Fluctuating pH values causes this problem. Most fish can tolerate a pH between 6.0 and 8.0. If the pH drops below 6.0 skin problems - acidosis - may develop. A pH above 8.0 on the other hand can cause the erosion of skin and gills.
Treatment:
An immediate water change is recommended. If the pH remains unchanged, check with your fish store. There are several products on the market that can either raise or lower your pH. If the pH fluctuates frequently, you should take routine measurements to assure a balance which your fish can tolerate
