The following inert rocks are safe to use: coal, basalt, flint, granite, sandstone, quartz, slate, and lava rock.
Rocks to avoid include chalk, limestone, marble, and tufa rock.
Calcareous rocks are often brittle or porous in appearance and should not be used in a planted aquarium.
Cobbles make good additions to the aquarium foreground.
Once washed, coal is a striking rock that is safe to use in the aquarium.
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