Just went through this with my baby blue hippo. Feed only garlic foods, turned on my uv sterilizer, fresh water diped him, and he had no spots on him within a week. No other fish affected. And he even had some spots on his eye. He looked like he was gonna lose his sight. Now after the ordeal I think he is brighter and more lively than ever. Keep up on the parameters and water changes. I kept feeding with garlic(indefinatly) and after a month I still see no spots on any one.