I think our Dwarf Gourami managed to cut himself on the single rock in the tank, and the cut on his nose has slowly worsened. We transferred him to a hospital tank about 3 weeks ago. The first week, I treated him with erythromycin and minocycline.
He showed some improvement but then his sore seemed to get worse. The last two weeks, I've been treating him with melaleuca (Melafix). He seemed somewhat better the first week, but lately has been looking worse.
Here are some pics of him from this evening: