Marina Mist Air Stone 3-Pack. The Elite Mist Air stone can be used in numerous shapes to create spectacular highlights in any aquarium. The ability for the curtain to be straight or curved are easily done, or you can thread the air curtain through ornaments, plants or rockworks for a beautiful aquatic world. The Elite Mist Air stone is extremely permeable, producing a full curtain of bubbles without strong air resistance. Provide powerful aeration and water agitation Replaces many air stones in common box filters and under-gravel riser stems Flexible, porous air tubes with large surface area Easy placement 3-Pack.