I have a 66 gallon tank. About 5 months ago all my fish had ick. All but one fish died. My blue tang survived. I did water changes and tested my water. Everything seemed good. I bought two clown fish and a clown tang. They died and only the blue tang survived. I just bought a brown tang and sail fish. Both just died and the blue tang still lives on. I have coral in my tank and it is all thriving. I feel like my blue tang is a serial killer LOL Does anyone know what the issue can be? I have had this tank almost seven years and never had this problem before. Ever since the fish got ick I can't seem to keep any new fish. All the fish that died came from different places.


