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Old 02-24-2012, 12:00 AM
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headz77 headz77 is offline
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Join Date: May 2011
Location: PDX, OR
Posts: 614
Yes, as mentioned above, if the levels of copper get too high it can harm the fish. But, when monitored, it can be effective. I am not a scientist so I won't argue long term safety. Most of my koi clients have fish that are worth thousands of dollars- so they are very well monitored. We have had no issues.
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