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The craggy texture and endless details in these stones allow you to easily create a natural-looking aquascape. Black Mountain Seiryu Stone has a darker gray and more pronounced veins compared to normal Seiryu, this effect is achieved by acid washing the stones. We personally like the darker grey, almost blueish tone of the Black mountain Seiryu more compared to regular light grey Seiryu.
Seiryu may slightly raise pH and water hardness.
