I have a black neon who developed a lump on his belly. Not even a week later it now looks like an open wound, but is not really swolen up like it was. Any ideas on what kind of illness it is? If you do, what would be the best medication to give the fish. I bought a corner filter and I'm conditioning it right now so I can put him in a small hospital tank so I can dose him and get him better!
Thanks!
Thanks!
