Aquarium gravel, also known as substrate, can range in size and color from small pebbles and sand to large river rocks, and it adds beauty to aquariums. But in addition to being decorative, it also serves a number of significant functions.

Substance used on the bottom of the tank, such as aquarium gravel, is referred to as substrate. The substrate of your aquarium is home to helpful bacteria that decompose plant debris, leftover food, and fish waste to maintain hygienic water conditions.