Spectrastone Special Black Aquarium Gravel for Freshwater Aquariums, 5-Pound Bag

Yes, it's a bag of gravel. It's black and coated with something smooth. It will not stain aquarium water nor change its pH. 5 pounds bag is perfect for a 5 gallon tank. I used it in my 5g Fluval Chi.

As far as I know, this is the most inexpensive gravel eligible for Amazon Prime.

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