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Hi,

I think the difference is cost. There may be some minor differences, but I've heard of both being used for aquariums.
 

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Discussion Starter · #3 ·
Thank you. I've not seen any difference mentioned anywhere, so naturally wondered because Seachem Onyx Sand and Seachem Gray Coast Calcite appear to be identical also. Seems companies are marketing products for multi-applications.
 
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