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<p>[QUOTE=&quot;John Anthony, post: 1632256, member: 42773&quot;]I don&#039;t like the sound of it. Why would you introduce an element into your biosphere that you had really no control over? The aquarium hobby is stocked with products made of inert materials, specifically so that you CAN control dosages of things like copper, should you need them. </p><p><br /></p><p>Stability is the key word when it comes to maintaining a specialized ecosystem. How do you know some odd metal ions won&#039;t disrupt the function of the anaerobic bacteria that constitute the organic filtration? If you tamper with that cycle, you may get high concentrations of ammonia and a tank full of dead fish.</p><p><br /></p><p>Too many unknowns. Keep the fish in the tank and the coins in an album.[/QUOTE]</p><p><br /></p>

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