I have a nyererei male and he is one of the best males I've ever owned. He isn't eating and is getting skinny. I am very worried and came to a conclusion that he has a parasitic infection. This is what I am going to do: I am going to do a 25% water change very week and add salt every time I add new water in. He's in a 60 gallon and what do you guys advise me to do? Thanks.