The following should only be used as a guide for the identification of potential fish diseases. If you have a problem related to fish disease in your aquarium, it is best to consult your local fish store for a diagnosis and possible treatment. 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.
Fluctuating pH values causes this problem. Most fish can tolerate a pH between 6.0 and 8.0. A pH above 8.0 on the other hand can cause the erosion of skin and gills. An immediate water change is recommended. If the pH remains unchanged, check with your fish store.