Hey everyone, new to this website. I have a black spotted freshwater eel that has been much less active lately. I believe he is sick or injured, but I’m not sure which one nor which disease. He has one large white patch near his tail. He is approximately 8 inches long and about 10 months old. He is housed in a 75 gallon tank with a blood parrot, tiger Oscar, and Pleco. Please help identify his issue. I am thinking on quarantining him, but I want to use that as a last resort as it puts a lot of stress on the fish. I will attach pictures. Water parameters are
Ph: 7.4
Ammonia: 0.25ppm
Nitrite: 0ppm
Nitrate: 0ppm
Ph: 7.4
Ammonia: 0.25ppm
Nitrite: 0ppm
Nitrate: 0ppm