For those who require a larger (round) air vent for large aquariums I recommend the LONDAFISH stone as they are huge compared to other air stones that I used. I have a 13 which is 5.1 inches and they offer an even larger size at 8.1-8.2 inches. One of the reasons I was looking for this is for outdoor growing aquariums. I want to make sure the aquarium air pump is making proper bubbles, but the airstone is larger than the usual three inch size and is perfect for that. air stone.
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