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Urchins are pretty long lived animals. There are some colder water species that are known to live for centuries, and it's very likely that their warmer water cousins live at least on the order of several decades if not a century. There's no reason they couldn't live just as long in captivity.
I don't see anything obviously wrong with the tank, though so I can't really recommend any action besides a waterchange. Does the iron supplement say what else it contains besides iron?
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