Aqua Gravel is natural river gravel from Japan.  It does not raise the hardness of the aquarium water.  It can be used directly as an aquarium substrate or as cosmetic gravel.  (Can be used for under gravel filter) 

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*Shipping cost is already included in this product, please select Free Shipping for all Aqua Gravel purchases at check out. NO expedited shipping option will be accepted.  We appreciate your kind understanding.