Last night I thought the little guy was a goner. But, we added more water to the tank and the next thing he was swimming around looking for food. We went out to run a few errands, came home to find he had eaten. This morning, he is swimming around and hungry. I crushed the medicated pellets and he's busy eating. He looks bad, has a white coating on his head, it looks sort of swollen, the red has moved along his body. At this point, I'm afraid to add anything (salt, melafix, etc.) to the water. I'm going to give him a water change later today and see what happens.