Product: Rock Quarz Natural Black 1 piece 1-2kg
Grey stone with sharp edges and crevices. It's best used with low growing plants (Glossostigma and Eleocharis).
Scheme reference stones
If you want to calculate roughly how many stones can stay healthy in your aquarium to create an effect similar to the beautiful natural scenery in which the fish live.
An aquarium of 80 litres needed 4 - 5 stones of this size for a natural effect:
Weight = 2.300 kg
Length = 28.5cm
Height max = 9cm
Depth = 11cm