hygger Weighted Nano Mist Bubble Wall Bar, 2-Pack 9.8" Self-Sinking ABS Air Stone Strip with Gentle Oxygen Diffuser for Freshwater & Marine Aquarium, HydroponicsBrand: hygger Color: black Features: Sinks & Stays Down: Featuring a weighted design, it sinks easily and remains stable, without floating or moving. Made of durable, corrosion resistant ABS and PVC plastic, safe for both freshwater and marine aquariums Discreet All Black Look: discreetly blends into the aquarium background. The full 9. 8 inch length produces a uniform wall of dense, tiny bubbles, ensuring even aeration throughout entire tank, while