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<p>[QUOTE=&quot;Vess1, post: 499738, member: 13650&quot;]Copper is an invertebrate killer.&nbsp; &nbsp; For example, it&#039;s well known in the reef aquarium hobby that if you have a reef with sick fish and you try to administer a copper treatment to rid them of their parasites, you&#039;ll also wipe out every coral, anemone, crab, worm, etc... that exists in the tank.&nbsp; &nbsp; Which in many cases can be thousands of dollars gone in a flash.&nbsp;&nbsp; There are trace amounts of copper in sea water but much more than that in an aquarium is lethal.</p><p><br /></p><p>&nbsp;&nbsp;&nbsp; Germs are invertebrates as well so I guess the door knob theory would make sense.&nbsp; That&#039;s actually pretty neat. </p><p><br /></p><p>&nbsp; I&#039;ve also heard of somebody shaving an old penny and feeding the copper to their dog to rid it of heartworms.&nbsp;&nbsp; Probably heard that one here.[/QUOTE]</p><p><br /></p>

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