one of my discus having a rot fin , pale color , blur eye , very slim body and no appetite. I wonder what sort of medicine would help these problems. What cause this to happen and what can I do to prevent this to happen again.
Fin rot can be very contagious. It will spread to all your fish. This is caused by poor quality of water. Change water frequently. Do not leave your tank unattended.
Apply Acriflavine solution plus salt. Change water and repeat the treatment for 5 days.