This morning I found one of my blue tetras swimming in circles on its side. The movements were quite fast. The fish looked fine otherwise, only it was thinner than the rest of the flock. I have already lost one blue tetra once to a tumor in the tail area. It was about four or more months ago.
After I came home from work I found the tetra still alive but the movements are faster. It looks even thinner and it seems like everyone and everything is bothering her. The fish is darker in color, the lilac sheen is gone, it looks like a small herring.
I really do not know how to help her. I can set up the quarantine tank, but it will take awhile. It is also chilly, so I will have to wait till it heats.
I suppose, nothing can help the poor fish now, anyway. I only wish to know what could have caused this terrible condition. I have never observed anything like it. I always thought that a fish would be passive and pale if ill, this one is frantic!