Aquarium Gravels & Sands (Substrates)

Aquarium Gravels & Sands which are also known as "Aquarium Substrates" are an essential internal component of any aquarium. They can be basic such as Pea Gravel, suitable for most non-specialised aquarium environments or decorative with bright colouration to create an effect. They can also be functional & essential such as Marine (Saltwater) sands & gravels & nutrient substrates for planted aquariums.