One of my betta's has a small hole on his head above his eye, it looks like he has caught it on something. Now the colour around the hole looks different, almost like fuzz around it and i am worried about infection. He is in a 3 gallon heated, filtered tank. He is eating and acting as normal, just resting a little more than usual. I have bought some aquarium salt today but added just less than half a tea spoon as an introduction.
Should I contine with the salts and if so, how much and how often?