Enhance the look of your fish tank with 25-lb Aqua Culture Aquarium Gravel. Bottom cover is an important part of every aquarium. It not only beautifies the underwater world but provides a surface for the growth of beneficial bacteria. This bacteria also helps to convert fish waste and keep the water clear and clean. Combining gravel with plants and decorations (sold separately) helps to provide cover and hiding places and creates a healthy and natural environment for your aquatic creatures. This fish aquarium gravel comes in a handy 25-lb pack.