Go baby O GO!!...seeing how much fin he has left its about the same amount my con is missing ^_^ once he is healed up and figures out how to swim with what he has left he will be doing wonderful!
Hmmm...I'm a nubie but I've had the same thing happen to I Oscar I purchased from Walmart.
A few days after I had him he appeared to have scale damage on his side as if he'd gotten beaten up. After a week or so I noticed his tail started vanishing. I eventually found out it was fin rot.
Unfortunately I dont have a picture of him the day I had to put him in fish heaven.
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