Ghost catfish turning black!
I have three ghost catfish and a couple days ago I noticed one of them turning kind of black! Does anyone have any idea what could be going on with it? I've had it for about a year and the other two for about three months. The other two are still normal and clear but the oldest one looks like it has black speckles and is vey dark for this type of fish.
Is it sick and going to die or is it okay?