Hydor ARIO 1 Aerator Internal Venturi Air Pump for Aquariums 3-13 gal

This aerator works just fine. It's a little tall, so I couldn't cover it up with gravel, which I would have preferred. Because of this, I think I like the airstones better.

However, this one was good for me because it came with everything I needed. When you buy the airstones, you normally have to buy a few things separately to make it work (the tubing, the airpump). I wouldn't have known what to buy if I had done that.

This one would probably work better with smaller tanks. I would recommend up to ten gallons.

This is, mechanically, the CO2 diffuser/reactor Hydor use to sell (but has since discontinued). AS an aerator, the other review probably is accurate works for up to a 10, maybe 20 gallon tank for oxygenating.

The same issue that was so very common with the same device as a CO2 reactor carries over to this product the tiny sponge (blue on this model, was black/dark grey on the old reactor) gets plugged up fairly quickly with debris and gunk, so has to be cleaned out fairly regularly or it loses its effectiveness.

This is an alternative that works just know that some maintenance is necessary.

And to the previous reviewer the reason you can't/shouldn't completely burry this in the gravel it will "eat" small bits of gravel and jam or even ruin the impeller. It is designed to be buried all the way to the bottom of the upper housing, so only area where the bubbles come out is exposed.

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