CaribSea Exotica “Mountain Stone” Rock (25 lb) – A collection of natural black and gray rocky pieces ideal for freshwater aquascaping. These craggy, textured stones closely resemble seiryu or mountain cliff formations, allowing aquarists to create dramatic underwater landscapes in planted or tropical aquariums. Inert and aquarium-safe, Mountain Stone does not alter water chemistry. Use it to build striking rock walls, caves, or high-peaked layouts—providing shelter for fish and a gorgeous, nature-inspired focal point in your tank.