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<p>[QUOTE=&quot;furryfrog02, post: 1632220, member: 41219&quot;]It also depends on what kind of fish you are keeping.&nbsp; Scaleless freshwater fish are less tolerant to copper than fish with scales since it is absorbed directly into their body through their skin.&nbsp; The additives you use when you do water changes specifically remove/neutralize(?) the copper for that very reason.&nbsp; It&#039;s bad for fish.&nbsp; While I don&#039;t think a few coins would be that harmful(dependent on the size of your tank), I certainly wouldn&#039;t put a treasure chest full in my aquarium and I have a 125 gallon in the living room.</p><p><br /></p><p>PS - I love it that my two hobbies, fish keeping and coin collecting, have combined into one.[/QUOTE]</p><p><br /></p>

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