Black Lava Rock which is formed from the intense heat of volcanos has many hidden benefits for the aquarium that many hobbyists are not even aware of, it is perfect for providing the ideal living environment for your aquarium because it has beneficial denitrifying bacteria. This bacteria will improve your water quality by reproducing and then removing nitrates.
Black Lava looks amazing surrounded by lush green plants as this adds a lovely contrast in colours in the aquarium.
The picture shows approximately 8 kg of Black Lava
5 Quantity = 5kg