
I ordered these air stones because I have had good results with the Aquaneat brand. The stones arrived in excellent condition, not broken or chipped. I've only tried one so far, but I assume the others work the same way. When I attached the air stone and placed it in the tank, the air bubbles that came out weren't very good. A little and more than I wanted and I couldn't adjust the airflow to compensate. I decided to leave the stone in the tank because I needed air in it and it wasn't critical that I have small bubbles in this particular tank. As it turned out, the air stone settled down in a few days and now releases copious amounts of small air bubbles without any further adjustments on my part. So they work well, they just need time to get going. I have ordered air stones from another brand and paid more to get better quality for my aquariums where I wanted a more reliable product. But for the price they do the job well and fit most of my smaller aquariums.

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