Pond Boss Forums Thread Like Summary - What attacked this SMB?

Heron?

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After coming back and looking at the last pics you posted, it might be a good thing if this fish just disappeared.. too much red indicating exposed skin that I'm guessing will blow up with fungus anyway.
I've done everything I know trying to revive some tuff looking fish and once the bare skin shows through like that, it's pretty much over.
I hope you don't see any more like that.
Edit: I might even suggest you dip that net in netsoak or H2O2 for a bit before using it on other fish..