03-31-2014, 06:02 PM
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Could be a lot of different things, could this fish have gotten caught in the intake of an HOB? I could also have been attacked and it looks like the scales were ripped off and fins roughed up. If there was zero discoloration prior, it is physical in nature, no parasitic or bacterial moving that fast.
Provide more information about tank set up and tankmates and maybe we can get to the bottom of this.