Fin Problems

Question
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Followup To
Question -
I just got a new fish, my others hae been doing very well. Well, this one looks like he has a broken back fin up at the top, part of it just sags, and his right fin he doesnt use much. And, he's in the tanks with 4 other fish, 3 slightly bigger than he, and one a sucker fish (plescatmos, or whatever - algae eater) and so i dont know if i should monitor him in a smaller tank or what. Any suggestions? Thanks for your time.
Answer -
Hi, it is not so much of a big deal it should heal.THANKS!!!!
Well, i'm guessing there was something wrong because it couldnt swim this morning, and then it died

Answer
Hi, usually brocken fins should heal, because i have had many fish in my life and quite a few had brocken fins and 95% of them survived and were fine.Some fish may have problems inside which can kill tisue like fins, this is called internal parisite wich eats the insides of the fish this is most likely what has happend to your fish, there is not that much you can do about it........