Liven up your aquarium and achieve a natural look with these Aqua Culture Large River Rocks. They come in a wide range of shapes and sizes to add an authentic look to your tank. These aquarium brown rocks offer a colorful alternative to gravel. They are safe for both fresh and salt water tanks. These accessories come in a convenient 48-oz bag. Unlike gravel, you can arrange them in several different ways to achieve a new look or create hideaways for your fish friends. Treat your aquatic friends to a change of scenery with these Aqua Culture Large River Rocks.