hygger Aquarium Air Stone, Fish Tank Bubbler, Nano Furnace Flue Round Stone Disk, Small Bubbles and High Dissolved Oxygen, with 2 Suction Cups, 1 Adjust Valve, 1 Check Valve (2 Inch)

This works very well and provides lots more bubbles than the usual air stones.

It satisfies the need of a standard no-frill bubble stone.

When its new the bubbles are very fine, now a month old, the bubbles are less fine, algae in the surface, maybe the cause. Its a good airstone whatever.

I primarily use this in a 5 gallon tank with African cichlid fry to get a little more air flow for them to stay healthy. I have it hooked up to a large air pump, but I'm running several other things from it including an adjustable valve to control air flow. You don't need a very powerful pump at all to get the desired effect from this air stone.It produces a large amount of small bubbles for a solid couple of weeks, then as it gets filled with minerals from the harder water and algae it diminishes slightly. After a few weeks it still works better than any other air stones, the bubbles are just slightly larger.A 30 minute soak in very light vinegar or peroxide and water with a quick scrub and it's back to its original state.The suction cups it came with are cheap and failed pretty quickly, but I didn't buy it for its suction cups. Not a deal breaker at all.Highly recommended for fry OR to help airate excess ammonia from a tank. Sometimes I switch it to the back compartment of my 15 gallon to aid with this and it clears up the ammonia in a day.

Nice fine bubbles and very quiet. Exceeds expectation.