Try the magnet trick first, but if you can't find it, I wouldn't worry about it at that point. Just be careful if you do find a better reason to tear down your rockwork.
My guess is that it will rust until it is completely covered and then it will just sit there since the core metal will be protected b the rust layer from oxidization. or it will just completely corrode. either way i dont think anything bad will come of it except maybe an iron induced algae bloom.
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