Marina 12-inch Bubble Air Stone – A long 12" air stone that creates a wide curtain of bubbles in your aquarium. When connected to a suitable air pump, this rod-shaped diffuser releases dozens of tiny bubbles along its length, which improves oxygenation over a large area. It’s ideal for big tanks or tall aquariums where a regular small airstone might not circulate enough air. The bubbling effect is also very attractive – it can be placed along the back wall to form a “bubble wall” or hidden under the gravel for an undersea volcano look. It not only looks great but also helps maintain healthy gas exchange in the tank.