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I never used it for substrate but I do have a slab of rock in the tank with no problems.
Stuff is kind of sharp. I'd use something smoother.
 

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I don't think it would be good to use it with bottom dwelling fish or fish that like to burrow due to it's 'sharpness'.

-Dave
 

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Granite is chemically stable so it will not have any effect on your water. However, as others said, it is sharp and may damage your plant/shrimp/fish whatever you have.
 
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