Rock Thousands Layer, size MD. Natural rock specifically selected to recreate natural aquariums with "Aquascaping" techniques or "Wild" biotopes Ideal for use in aquariums, paludariums, water terrariums and terrariums It is essential to wash it under abundant running water before placing it in the aquarium to eliminate dust, earth and other residues LIMESTONE ROCK - can increase the hardness of the water Natural product - each piece is unique and can differ from the others in weight, shape, color and size AVAILABLE DIMENSIONS: XS about 300 - 600 gr SM about 0,6 - 2 Kg MD about 2 - 3 Kg