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Lava rock is popular in planted aquariums due to it's rough texture its ideal for planting mosses on. It can also be used stacked upon one another to build the hardscape of your aquascape. Also creating caves for Shrimp and fish to hide in. Lava rock is lighter than most other rock, formed by the solidification of magma. It won't alter your water.
Often has a mixture of mostly red and a bit of black colours.