The Estes Spectrastone Special Freshwater Aquarium Gravel series features a dazzling gravel that infuses your tank with the vibrant color of tropical waters. This gravel’s bright, Caribbean hue is sealed in a non-toxic coating, making it completely safe for fish, invertebrates, and plants. When used as substrate, it creates a stunning contrast with rock and wood elements and accentuates the vivid colors of fish like guppies or tetras. Just like other Estes gravels, it provides surface area for beneficial bacteria to thrive, contributing to a healthy aquarium ecosystem while transforming your tank into a visually striking underwater paradise. Available in Multiple Colors