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My smallest cory has a fin oddity. I'm embarassed to say I haven't really seriously looked at him as an individual since I got him because he's so small and shy that he is rarely at the front of the tank, but he was today and as I was looking at him I noticed that the lower part of the caudal fin is barely there. I can't see any raggedness, but I'm a bit concerned. Does this happen sometimes, or should I be worried about finrot or something? If I should I have maracyn and I could isolate him I guess...