I keep my betta in a 2 gallon tank with a heater. A few days ago I noticed he started losing his color. Then two days ago he started hanging around the surface gasping for air. I did a full water change and he didn't improve. I then noticed that he had a cloudy swollen eye so I started him on Melafix right away. He's been on the medicine for 3 days. His eye is looking better but he's still gasping and refuses to eat. What do I do??


