safe or not safe

B

blureef2

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I am going to be using gray shores sand by seachem for my tank, however I need something different in size but black for my jawfish to burrow, I started to look at seachem's Onyx gravel, they say on the description that its great for reef applications, yet in the spec sheets it says that it contains copper. Do you guys think it really is reefsafe??
here is the link..
http://www.seachem.com/products/product_pages/OnyxGravel.html


please let me know what you think guys
 
if my conversion is correct 4 mg/kg is one part per 10 to the minus 6 or million. so 4 mg/kg is the same as 4 ppm.

natural seawater has 0.0009 ppm, so the concetration is alot higher then natural seawater. They claim it's reef safe so it must stay in solid form in the gravel, but I would ask them.
 
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