Hi,
Its either Skinny Disease, which is a bacterial infection, or bloat. Usually with bloat one of the first symptoms is loss of appetite so I'm more inclined to think this is Skinny Disease. The major symptom with Skinny Disease is that the fish becomes incredibly imaciated looking but continues to eat.
The treatment for Skinny Disease is Erythromycin. Look for Maracyn at the fish store. Do a large partial water change prior to treatment. This disease is contagious but fish who are otherwise healthy probably won't get it. With the cost of Maracyn you might want to treat in a separate tank.
Please post back with any additional questions and good luck with the rest of your fish.
Robin
Its either Skinny Disease, which is a bacterial infection, or bloat. Usually with bloat one of the first symptoms is loss of appetite so I'm more inclined to think this is Skinny Disease. The major symptom with Skinny Disease is that the fish becomes incredibly imaciated looking but continues to eat.
The treatment for Skinny Disease is Erythromycin. Look for Maracyn at the fish store. Do a large partial water change prior to treatment. This disease is contagious but fish who are otherwise healthy probably won't get it. With the cost of Maracyn you might want to treat in a separate tank.
Please post back with any additional questions and good luck with the rest of your fish.
Robin