Indian Stone Aquarium Chips & Pebbles | Gravels | Stones and Rocks | Decoration Items |Sands. Best Quality Aquarium Substrates | 25 Kg.Type:ChIPSUsed For Salt Water and Fresh WaterSuitable For PlantedBlackchipsFor Aquarium Decoration, A black aquarium substrate can add great contrast in colors from other rock or decoration in your tank, black will really stand out againstbog-woodand slate rocks. Gravels are one of the most important parts of the aquarium because They keep water fresh and healthy a long and long time by absorbing all the waste. They work as a good biological filter because most of the healthy bacteria grow between them. They work as a great part of the decoration. These provide a very healthy environment for plants and fishes. The minimum 2.5-inch layer of gravels is very important for the healthy aquarium, en_US: Indian Stone Aquarium Chips & Pebbles | Gravels | Stones and Rocks | Decoration Items |Sands. Best Quality Aquarium Substrates | 25 Kg.Type:ChIPSUsed For Salt Water and Fresh WaterSuitable For PlantedBlackchipsFor Aquarium Decoration, A black aquarium substrate can add great contrast in colors from other rock or decoration in your tank, black will really stand out againstbog-woodand slate rocks. Gravels are one of the most important parts of the aquarium because They keep water fresh and healthy a long and long time by absorbing all the waste. They work as a good biological filter because most of the healthy bacteria grow between them. They work as a great part of the decoration. These provide a very healthy environment for plants and fishes. The minimum 2.5-inch layer of gravels is very important for the healthy aquarium}