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nope. never put metal in fish tanks, ESPECIALLY rusty metal. Rust is dangerous to humans if we get wounded with it, so why expose it to fish? It (not the rust but the metal in general) can leech harmful metals into your tank and alter the chemistry of your tank, the result ending in dead fish. I don't know how it effects plants, but I wouldn't test it.

I believe lead is the only thing you can put in fish tanks, correct me if I'm wrong.
 
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