Activated Carbon

I have some leftover Activated Carbon from a fish tank that is new, so I wondered if it would do any harm to add it to my vegetable garden's earth. It is safe for fish, so why should it not be safe for plants that I eat? Anybody see a problem with it?
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Hi Trompiano, Mike D here, I don't think that fish tank charcoal will hurt the plants, nor will it do any good, in my opinion.
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