- Mini Volcano Decoration: The aquarium decoration is modeled after the natural appearance of volcanos. It greatly brightens your plain fish tank to make it more attractive. - Realistic Aquarium Ornament: 2.6" L x 1.8" H. Suitable size for decorating 5 to 20 gallon fish tanks or fish bowls. A quite eye-catching embellishment for your fish tank. (NOTE: Soak it in the water for at least 24 hours before use.) - Vivid Landscape: Come with a built-in air stone at bottom. Strings of bubbles from the air stone spout from the bubbler. It contrasts finely with the overflowing lava and creates a rare scene of volcanic eruption. - Constant Aeration: The air stone generates a cascade of dense bubbles quietly. A great way to increase oxygen solubility in your aquariums and enliven the aquatic lives. (You need an extra pump for bubbling.) - Reliable Material: This appealing volcano ornament is made of healthy resin with natural painting which cannot be washed out easily. Trustworthy to keep fish lively anytime while adorning the tank.