Is this sand ok for freshwater?

[vincentliu89]

Its called "natures ocean premium marine substrates" the description says its straight from the ocean, so is this only for saltwater tanks?


http://www.petco.com/product/7534/Nature-s-Ocean-Premium-Marine-Substrates.aspx

 

[cchhcc]

OK for Africans (rift lake) and CA cichlids but bad for anything that doesn't like hard alkaline water.