My tetras are dying. Can anyone identify from these pictures what this is? The fish still acts fairly normal, looks like it has a bit of an abrasion, then it starts getting bigger, a bit pinkish and white stuff around the edges but I don't know if that is fungus, skin or secondary infection. After awhile the fish hangs out in a corner and eventually dies. I have lost two neons and three lemons in the last couple of days. The neons went real fast and didn't show any symptoms like the lemons.

