So I got a UV filter and things are not going downhill fast- 2 that were already looking bad died- but another fish that was fine died pretty suddenly. So that means my water parameters are normal, filtration is above what is needed, and now I also have UV filter. So what is happening? Was that guy maybe sick but I couldn't tell? He died months after i put in the UV.Is nothing working? I'm bummed I thought UV was the cure.
