[DanM1939]

I have a yellow lab in my hap/ peacock tank that seems to have developed some redness toward the end of its tail, see attached pictures. Any idea what this could be? The fish is eating and acting normal otherwise, and no other fish in the tank seems to have any issues.

 

[DJRansome]

How is the fish now? It does not look overly red to me. If it is still there it may be septicemia.