My male opaline gourami has developed some sort of growth right above his eye. He is normally a shy fish, but I know it wasn't there 48 hours ago. It is red, with some white fuzz. The aquarium is 29 gallons with a male/female pare of opaline gourami, and 5 leopard danios. I do 30-40% water change every other week and have no chemicals in the tank other then the carbon in my filter. Any idea what it is and how to treat it? Any help is greatly appreciated.