I bought these stones to use as aquarium gravel. The stones look like real glass. They are very black, tiny and smooth. I like the fact that they don't affect the pH of the aquarium water. The fish and decorations really seem to stand out against the glossy black substrate. I used 2 bags that barely covered the bottom of my 10 gallons. Tank. I found the stones to be overpriced, especially if you have a large aquarium.
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