Pangasius Cats

[Storm]

I have two Pangasius Cats that I treated successfully for ich. At one point during the treatment, one of the cats developed some blood red coloring which appeared to be on the inside of his tail fin. He didn't seem injured otherwise but I started treating the tank with MelaFix, too. The color on his tail fin cleared up and I thought he was on the road to recovery. They are still in a QT and this morning I woke up to find both of the cats have blood red coloring in their top fins. Any ideas as to what this is and how I can successfully treat it?

 

[clutterydrawer]

from what I've read, blood-streaked fins is usually a sign of septicaemia. There may be other reasons but I'm not aware of them and I did a lot of research on it a while ago when one of my fish was showing abnormal redness.