What Kind of Air Stone Should I Use? A bigger air stone needs a more powerful pump to produce more bubbles. Basically bigger air stones can produce more nice bubbles and they're used for powerful air pumps. If you connect a bigger air stone to a small pump, the bubbles will be produced only at the front of the stone. Small pumps go well with small air stones while powerful pumps and small stones don’t get along well. Makes Lots of Bubbles --Aquarium air stones moderate in size and outputs a large steady stream of tiny bubbles, no leaks, add enough oxygen to your fish, and also make your fish tank more beautiful. --Air stones extend the life of your nutrient solution, help keep roots healthy, and promote exceptional growth. This stone is a must have for your aquariums. Specifications -- Material: Silicon carbide, plastic --Suitable occasion: fish tank, aquarium, hydroponics and so on Note: --Please soak the air stone in water for about 30 minutes before first use. --If the air stone doesn't have bubbles in one part, please change the pump of higher power. After a long-term usage, please clean it if bubbles lessen. 4 inch air stone (6 pack) 4 inch air stone (12 pack) 6 inch air stone (2 pack) 6 inch air stone (4 pack) Add to Cart Add to Cart Buying Options Buying Options Customer Reviews 4.5 out of 5 stars 175 4.5 out of 5 stars 175 4.6 out of 5 stars 44 4.6 out of 5 stars 44 Price $21.99$21.99 $31.99$31.99 — no data — no data Size 4 INCH 4 INCH 6 INCH 6 INCH Quantity 6 PACK 12 PACK 2 PACK 4 PACK