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I have heard old tales that old folk used to throw rusty nails under tress to make them do better. Maybe just a myth and of course no fish involved.
Doing a search online, pulled up info about people using rusty nails as a source of iron for different trees. That being said I would not recommend it being used in aqauriums. Ny concern would be any metals that may leach into the water, which could possibly be harmful to the inhabitants. When it comes to my fish I'd rather err on the side of caution.
 
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