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Ive said it before and will probably say it again but......NLS actively adds copper to their foods......
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The copper New Life
used to add, was a minute amount, added as a dietary supplement, and it has never been shown to have any type of negative effect on marine life. Most marine salts also contain trace amounts of copper, and always have. Joe Yaiullo, one of the pioneers of reef keeping in the USA, and the curator/co-founder of Atlantis Marine World in NY has been feeding NLS for the past decade. His reef tank is the largest in North America, and 4th largest in the world. I think he knows what he's doing.
Charles Delbeek M.Sc., senior biologist at the Steinhart Aquarium in San Francisco also feeds NLS at their facility. Neither experienced any negative issues due to the copper supplement that
used to be added to NLS.
Either way, New Life stopped adding a copper supplement when they began making their own food, at their own facility. The raw ingredients now contain enough nutrient supplementation that bioavailability is no longer a concern.
This will be reflected when their new labels begin to roll out over the course of next year.
FYI - New Era also lists copper under the mineral profile of their food. (23 mg/kg in their marine foods) and ON foods also contain copper, as was shown in this past discussion on the exact same topic that you posted in a couple of yrs ago.
http://www.canreef.com/vbulletin/showthread.php?t=54356
The fact that a commercial pellet or flake doesn't list copper on their label, certainly does not equate to that food not actually containing copper. Almost all commercial foods on the market contain trace amounts of copper, and for good reason, it's an
essential trace element.
For those interested, some further reading on the role that copper plays in the health of marine life.
http://www.copper.org/publications/n...er_health.html
HTH