I need some advice, my blue Gourami has a sizable sore on its left side near the gill. It's pinkish like it could've rubbed on a rock or piece of wood when the lights went out but not sure. So I put it in a small hospital tank (2.5 Gal), and added a flat teaspoon of aquarium salt... I'm not sure what else I can add to the water that would help it heal or get rid of the illness it may have. I'm open to any and all suggestions please. Thank you