My betta has (what i assume to be) fin rot and I don’t know how I can cure it. (or if it can be cured at this point) He’s in a 5 gallon tank with a filter and a heater. When I went to petco I couldn’t find any medicine for fin rot there. What should I do? UPDATE: I also just realized he also has a white puffed up eye so I really don’t know what I can do to help him










