Picture of the fish and one of the entire tank?
What are the tank dimensions?
What is the water temperature?
What is the ammonia, nitrite, nitrate, pH, GH & KH of the water?
How often do you do water changes and how much do you change?
Do you gravel clean the substrate when you do a water change?
Do you dechlorinate the new water before adding it to the tank?
What sort of filter is on the tank?
How often and how do you clean the filter?
What do you feed the fish?
How often do you feed the fish?
Have you ever treated the fish for anything?